This document discusses analyzing systems based on the publisher-subscriber architectural style. It describes analyzing a NASA system called GMSEC that uses this style. Static analysis is used to understand how components connect and communicate. Dynamic analysis involves monitoring a running system to understand behavior, such as which subscribers receive messages from which publishers. This analysis uncovered a high-priority bug and provided valuable insights into GMSEC.
Distributed Event Routing in Publish/Subscribe SystemsRoberto Baldoni
The document discusses publish/subscribe communication systems. It describes the key aspects of the publish/subscribe paradigm including publishers that produce events, subscribers that declare interests via subscriptions, and an event notification service that matches published events to subscriptions. It then summarizes different types of publish/subscribe systems including topic-based, hierarchy-based, and content-based approaches. Finally, it outlines several routing algorithms used in event notification services to efficiently route events from publishers to interested subscribers.
Verifying Architectural Design Rules of a Flight Software Product LineDharmalingam Ganesan
This document discusses verifying architectural design rules of the Core Flight Software (CFS) product line. [1] It provides background on the CFS, which is a reusable flight software environment developed by NASA. [2] The analysis used tools to check that the CFS implementation follows documented rules regarding dependencies, decomposition, redundancy, and preprocessor usage. [3] It found some minor violations but concluded the CFS team performs rigorous design and code reviews.
IMPROVING TRANSMISSION EFFICIENCY IN OPTICAL COMMUNICATIONradziwil
This work address problem of inefficient bandwidth utilization in optical
telecommunication systems that is caused by network impairments such as
latency, congestion, packet loss ratio and error ratio.
The proposed solution is software based system that implements User
Datagram Protocol (UDP), Java platform. and custom designed
transmission control mechanisms.
Message Queuing (MSMQ) technology enables applications running at different times to communicate across heterogeneous networks and systems that may be temporarily offline.
This document describes a design approach using UML 2.0 for specifying stream processor systems. Key aspects include:
1. UML 2.0 notations like composite classes, ports, and hierarchical statecharts are used to abstractly specify stream processors and applications.
2. Specifications are translated to SystemC models, including a TLM simulator and RTL code.
3. A case study demonstrates specifying a real-time stream processor in UML 2.0 and generating SystemC models for verification.
This document discusses techniques for high-speed traffic capture and analysis using open-source software and commodity hardware. It describes PF_RING, an open-source packet processing framework that can accelerate packet capture to wire speed without packet loss. PF_RING uses techniques like socket clustering and dynamic bloom filtering to distribute packet processing across CPU cores and support thousands of packet filters without performance degradation. It also discusses extending PF_RING's filtering capabilities to support features like port ranges, address masking, and layer 7 inspection while avoiding the limitations of traditional BPF filtering.
This document discusses traditional communication architectures for multiprocessor systems and proposes that Active Messages is a better communication architecture. It analyzes three traditional low-level communication layers - message passing, message driven, and shared memory - and argues that they are best viewed as communication models implemented on top of a general-purpose communication architecture like Active Messages, rather than as architectures themselves. The document provides an example implementation of the send and receive communication model using Active Messages on the CM-5 to demonstrate how it can be implemented efficiently while gaining flexibility.
Distributed Event Routing in Publish/Subscribe SystemsRoberto Baldoni
The document discusses publish/subscribe communication systems. It describes the key aspects of the publish/subscribe paradigm including publishers that produce events, subscribers that declare interests via subscriptions, and an event notification service that matches published events to subscriptions. It then summarizes different types of publish/subscribe systems including topic-based, hierarchy-based, and content-based approaches. Finally, it outlines several routing algorithms used in event notification services to efficiently route events from publishers to interested subscribers.
Verifying Architectural Design Rules of a Flight Software Product LineDharmalingam Ganesan
This document discusses verifying architectural design rules of the Core Flight Software (CFS) product line. [1] It provides background on the CFS, which is a reusable flight software environment developed by NASA. [2] The analysis used tools to check that the CFS implementation follows documented rules regarding dependencies, decomposition, redundancy, and preprocessor usage. [3] It found some minor violations but concluded the CFS team performs rigorous design and code reviews.
IMPROVING TRANSMISSION EFFICIENCY IN OPTICAL COMMUNICATIONradziwil
This work address problem of inefficient bandwidth utilization in optical
telecommunication systems that is caused by network impairments such as
latency, congestion, packet loss ratio and error ratio.
The proposed solution is software based system that implements User
Datagram Protocol (UDP), Java platform. and custom designed
transmission control mechanisms.
Message Queuing (MSMQ) technology enables applications running at different times to communicate across heterogeneous networks and systems that may be temporarily offline.
This document describes a design approach using UML 2.0 for specifying stream processor systems. Key aspects include:
1. UML 2.0 notations like composite classes, ports, and hierarchical statecharts are used to abstractly specify stream processors and applications.
2. Specifications are translated to SystemC models, including a TLM simulator and RTL code.
3. A case study demonstrates specifying a real-time stream processor in UML 2.0 and generating SystemC models for verification.
This document discusses techniques for high-speed traffic capture and analysis using open-source software and commodity hardware. It describes PF_RING, an open-source packet processing framework that can accelerate packet capture to wire speed without packet loss. PF_RING uses techniques like socket clustering and dynamic bloom filtering to distribute packet processing across CPU cores and support thousands of packet filters without performance degradation. It also discusses extending PF_RING's filtering capabilities to support features like port ranges, address masking, and layer 7 inspection while avoiding the limitations of traditional BPF filtering.
This document discusses traditional communication architectures for multiprocessor systems and proposes that Active Messages is a better communication architecture. It analyzes three traditional low-level communication layers - message passing, message driven, and shared memory - and argues that they are best viewed as communication models implemented on top of a general-purpose communication architecture like Active Messages, rather than as architectures themselves. The document provides an example implementation of the send and receive communication model using Active Messages on the CM-5 to demonstrate how it can be implemented efficiently while gaining flexibility.
This document contains a chapter on communication from a distributed systems textbook. It discusses several key topics:
- Layered communication protocols, from the physical layer up through transport, middleware, and application layers. TCP and UDP are mentioned as standard transport protocols.
- Client-server and messaging models of communication. Client-server uses synchronous requests while messaging focuses on asynchronous persistent messages.
- Remote procedure call (RPC) as a way to make calls to remote procedures seem like local calls. RPC hides the communication by using a procedure call mechanism between client and server.
This document describes a process called PREREQUIR that uses cluster analysis to recover pre-requirements from stakeholder input. It involves collecting requirements from stakeholders, mapping them to vectors, clustering the vectors, and labeling the clusters. A case study applying this process to recover browser requirements from 22 stakeholders is described, with the results achieving 70% accuracy in clustering and 70-80% recall and precision when validated. Threats to the validity of the approach are also discussed.
This document discusses using GNU/Linux for safety-related systems. It introduces GNU/Linux and its development process using tools like git. It also discusses kernel development tools like git, cscope, sparse and tools for testing like gcov and gprof. Finally, it discusses safety standards like IEC 61508 and requirements for the highest safety integrity level like those in EN 50128, including requirements for modular design, coding standards, testing and configuration management. The goal is to determine if GNU/Linux is suitable for safety-critical applications.
Senthilkanth,MCA..
The following ppt's full topic covers Operating System for BSc CS, BCA, MSc CS, MCA students..
1.Introduction
2.OS Structures
3.Process
4.Threads
5.CPU Scheduling
6.Process Synchronization
7.Dead Locks
8.Memory Management
9.Virtual Memory
10.File system Interface
11.File system implementation
12.Mass Storage System
13.IO Systems
14.Protection
15.Security
16.Distributed System Structure
17.Distributed File System
18.Distributed Co Ordination
19.Real Time System
20.Multimedia Systems
21.Linux
22.Windows
Ultra-scalable Architectures for Telecommunications and Web 2.0 ServicesMauricio Arango
This document discusses how telecommunications and web services are adopting horizontal scaling and parallel architectures to handle enormous growth. It describes how event-driven applications are well-suited for parallelism and how middleware like tuple spaces, message queues, and publish/subscribe systems provide coordination and scalability. Finally, it argues that horizontal scalability requires parallel designs from the start and that simple middleware models with distributed caching can effectively support both communication and data management needs.
The document discusses multimedia networking technologies. Chapter 1 covers RTP and RTCP for multimedia transmission over IP networks. It describes RTP packet formats, RTCP packet types including SR, RR and SDES, and how RTP implements voice and video streaming. It also discusses quality of service techniques for multimedia networking including scheduling, policing, packet classification, and call admission control.
The document describes a Java framework called FJTask that supports fork/join parallel programming. FJTask is based on the work-stealing scheduler design from Cilk. It uses a pool of worker threads that each maintain a double-ended queue of tasks. When a worker finishes its tasks, it can "steal" tasks from other workers. FJTask provides lightweight executable tasks instead of using Java threads directly to reduce overhead. It implements efficient double-ended queues and work stealing to allow good parallel performance of fork/join programs in Java.
2. Distributed Systems Hardware & Software conceptsPrajakta Rane
This document discusses distributed system software and middleware. It describes three types of operating systems used in distributed systems - distributed operating systems, network operating systems, and middleware operating systems. Middleware operating systems provide a common set of services for local applications and independent services for remote applications. Common middleware models include remote procedure call, remote method invocation, CORBA, and message-oriented middleware. Middleware offers services like naming, persistence, messaging, querying, concurrency control, and security.
The document discusses various architectural styles used in software design. It describes styles such as main program and subroutines, object-oriented, layered, client-server, data-flow, shared memory, interpreter, and implicit invocation. Each style has different components, communication methods, and advantages/disadvantages for managing complexity and promoting qualities like reuse and modifiability. Common examples of each style are also provided.
OSGi Applications Clustering using Distributed Shared MemoryAnthony Gelibert
This document discusses clustering OSGi applications using distributed shared memory. It proposes using distributed shared memory to replicate OSGi services across multiple platforms. This allows services to be clustered without reengineering. The approach is validated using several use cases including event propagation and state sharing for mobile games. Future work includes enhancing the Terracotta container and supporting dynamic updates of clustered services.
The document outlines tasks for an IT mentor position at IDM Computer Studies covering investigating current network infrastructures, recommending network solutions, analyzing security threats, planning software and hardware installations, and creating training materials. It provides background on IDM which operates computer education programs across Sri Lanka and describes the technical setup of its head office and branches. The tasks involve assessing, upgrading, and supporting the systems, software, and networks used at IDM.
A DSEL for Addressing the Problems Posed by Parallel ArchitecturesJason Hearne-McGuiness
The document proposes a domain-specific embedded language (DSEL) to address issues with programming parallel architectures. The DSEL aims to add parallelism capabilities to an existing language with minimal changes. It defines types like thread pools and safe collections. The DSEL is designed to provide guarantees around correctness and efficiency of generated schedules while avoiding issues with other parallel programming approaches. An implementation in C++ exists to demonstrate the DSEL.
Folt - Open TMS - A presentation for universitiesKlemens Waldhör
This document provides an overview of the Open Translation Memory System (OpenTMS) project. It discusses the goals of developing an open-source translation memory system, the requirements and architecture of OpenTMS, and the current status of its implementation including programming languages used and available downloads. The document also outlines possible contributions to further developing OpenTMS.
A framework for distributed control and building performance simulationDaniele Gianni
Presentation delivered at the 3rd IEEE Track on
Collaborative Modeling & Simulation - CoMetS'12.
Please see http://www.sel.uniroma2.it/comets12/ for further details.
- .NET remoting allows objects to be placed remotely across a network where they can communicate with local objects.
- Remote objects are activated in different ways as client-activated objects which have a finite lease time or server-activated objects which can accept single or multiple calls.
- The document provides details on remote objects, channels for message passing, and activation methods and gives examples of creating a remotable class.
Message Passing, Remote Procedure Calls and Distributed Shared Memory as Com...Sehrish Asif
Message Passing, Remote Procedure Calls and
Distributed Shared Memory as Communication Paradigms for Distributed Systems & Remote Procedure Call Implementation Using Distributed Algorithms
Distributed Shared Memory – A Survey and Implementation Using OpenshmemIJERA Editor
Parallel programs nowadays are written either in multiprocessor or multicomputer environment. Both these
concepts suffer from some problems. Distributed Shared Memory (DSM) systems is a new and attractive area of
research recently, which combines the advantages of both shared-memory parallel processors (multiprocessors)
and distributed systems (multi-computers). An overview of DSM is given in the first part of the paper. Later we
have shown how parallel programs can be implemented in DSM environment using Open SHMEM.
This presentation is about a lecture I gave within the "Software systems and services" immigration course at the Gran Sasso Science Institute, L'Aquila (Italy): http://cs.gssi.infn.it/.
http://www.ivanomalavolta.com
Demonstrate a Chosen Ciphertext Attack when Crypto constructs are not used correctly. Detailed steps are given. The slides show how to attack the unauthenticated symmetric encryption in the OFB mode.
Secure application programming in the presence of side channel attacksDharmalingam Ganesan
This document discusses secure programming patterns to harden code against side channel attacks. It describes several patterns such as using random offsets when accessing arrays instead of sequential access, verifying full data before authentication instead of early failure, using non-trivial constants, verifying loop and data integrity with checksums, and choosing constants with maximum hamming distance for fault resistance. Implementing these patterns makes reverse engineering and attacks like fault injection more difficult.
1) The document describes an approach for automated testing of large multi-language software systems using cloud computing.
2) Key aspects of the approach include generating test cases from models of software APIs and interfaces and executing them using tools like JUnit and Selenium.
3) The approach was applied to test portions of NASA software like GMSEC and CFS, and was able to find bugs not discovered with manual testing.
This document contains a chapter on communication from a distributed systems textbook. It discusses several key topics:
- Layered communication protocols, from the physical layer up through transport, middleware, and application layers. TCP and UDP are mentioned as standard transport protocols.
- Client-server and messaging models of communication. Client-server uses synchronous requests while messaging focuses on asynchronous persistent messages.
- Remote procedure call (RPC) as a way to make calls to remote procedures seem like local calls. RPC hides the communication by using a procedure call mechanism between client and server.
This document describes a process called PREREQUIR that uses cluster analysis to recover pre-requirements from stakeholder input. It involves collecting requirements from stakeholders, mapping them to vectors, clustering the vectors, and labeling the clusters. A case study applying this process to recover browser requirements from 22 stakeholders is described, with the results achieving 70% accuracy in clustering and 70-80% recall and precision when validated. Threats to the validity of the approach are also discussed.
This document discusses using GNU/Linux for safety-related systems. It introduces GNU/Linux and its development process using tools like git. It also discusses kernel development tools like git, cscope, sparse and tools for testing like gcov and gprof. Finally, it discusses safety standards like IEC 61508 and requirements for the highest safety integrity level like those in EN 50128, including requirements for modular design, coding standards, testing and configuration management. The goal is to determine if GNU/Linux is suitable for safety-critical applications.
Senthilkanth,MCA..
The following ppt's full topic covers Operating System for BSc CS, BCA, MSc CS, MCA students..
1.Introduction
2.OS Structures
3.Process
4.Threads
5.CPU Scheduling
6.Process Synchronization
7.Dead Locks
8.Memory Management
9.Virtual Memory
10.File system Interface
11.File system implementation
12.Mass Storage System
13.IO Systems
14.Protection
15.Security
16.Distributed System Structure
17.Distributed File System
18.Distributed Co Ordination
19.Real Time System
20.Multimedia Systems
21.Linux
22.Windows
Ultra-scalable Architectures for Telecommunications and Web 2.0 ServicesMauricio Arango
This document discusses how telecommunications and web services are adopting horizontal scaling and parallel architectures to handle enormous growth. It describes how event-driven applications are well-suited for parallelism and how middleware like tuple spaces, message queues, and publish/subscribe systems provide coordination and scalability. Finally, it argues that horizontal scalability requires parallel designs from the start and that simple middleware models with distributed caching can effectively support both communication and data management needs.
The document discusses multimedia networking technologies. Chapter 1 covers RTP and RTCP for multimedia transmission over IP networks. It describes RTP packet formats, RTCP packet types including SR, RR and SDES, and how RTP implements voice and video streaming. It also discusses quality of service techniques for multimedia networking including scheduling, policing, packet classification, and call admission control.
The document describes a Java framework called FJTask that supports fork/join parallel programming. FJTask is based on the work-stealing scheduler design from Cilk. It uses a pool of worker threads that each maintain a double-ended queue of tasks. When a worker finishes its tasks, it can "steal" tasks from other workers. FJTask provides lightweight executable tasks instead of using Java threads directly to reduce overhead. It implements efficient double-ended queues and work stealing to allow good parallel performance of fork/join programs in Java.
2. Distributed Systems Hardware & Software conceptsPrajakta Rane
This document discusses distributed system software and middleware. It describes three types of operating systems used in distributed systems - distributed operating systems, network operating systems, and middleware operating systems. Middleware operating systems provide a common set of services for local applications and independent services for remote applications. Common middleware models include remote procedure call, remote method invocation, CORBA, and message-oriented middleware. Middleware offers services like naming, persistence, messaging, querying, concurrency control, and security.
The document discusses various architectural styles used in software design. It describes styles such as main program and subroutines, object-oriented, layered, client-server, data-flow, shared memory, interpreter, and implicit invocation. Each style has different components, communication methods, and advantages/disadvantages for managing complexity and promoting qualities like reuse and modifiability. Common examples of each style are also provided.
OSGi Applications Clustering using Distributed Shared MemoryAnthony Gelibert
This document discusses clustering OSGi applications using distributed shared memory. It proposes using distributed shared memory to replicate OSGi services across multiple platforms. This allows services to be clustered without reengineering. The approach is validated using several use cases including event propagation and state sharing for mobile games. Future work includes enhancing the Terracotta container and supporting dynamic updates of clustered services.
The document outlines tasks for an IT mentor position at IDM Computer Studies covering investigating current network infrastructures, recommending network solutions, analyzing security threats, planning software and hardware installations, and creating training materials. It provides background on IDM which operates computer education programs across Sri Lanka and describes the technical setup of its head office and branches. The tasks involve assessing, upgrading, and supporting the systems, software, and networks used at IDM.
A DSEL for Addressing the Problems Posed by Parallel ArchitecturesJason Hearne-McGuiness
The document proposes a domain-specific embedded language (DSEL) to address issues with programming parallel architectures. The DSEL aims to add parallelism capabilities to an existing language with minimal changes. It defines types like thread pools and safe collections. The DSEL is designed to provide guarantees around correctness and efficiency of generated schedules while avoiding issues with other parallel programming approaches. An implementation in C++ exists to demonstrate the DSEL.
Folt - Open TMS - A presentation for universitiesKlemens Waldhör
This document provides an overview of the Open Translation Memory System (OpenTMS) project. It discusses the goals of developing an open-source translation memory system, the requirements and architecture of OpenTMS, and the current status of its implementation including programming languages used and available downloads. The document also outlines possible contributions to further developing OpenTMS.
A framework for distributed control and building performance simulationDaniele Gianni
Presentation delivered at the 3rd IEEE Track on
Collaborative Modeling & Simulation - CoMetS'12.
Please see http://www.sel.uniroma2.it/comets12/ for further details.
- .NET remoting allows objects to be placed remotely across a network where they can communicate with local objects.
- Remote objects are activated in different ways as client-activated objects which have a finite lease time or server-activated objects which can accept single or multiple calls.
- The document provides details on remote objects, channels for message passing, and activation methods and gives examples of creating a remotable class.
Message Passing, Remote Procedure Calls and Distributed Shared Memory as Com...Sehrish Asif
Message Passing, Remote Procedure Calls and
Distributed Shared Memory as Communication Paradigms for Distributed Systems & Remote Procedure Call Implementation Using Distributed Algorithms
Distributed Shared Memory – A Survey and Implementation Using OpenshmemIJERA Editor
Parallel programs nowadays are written either in multiprocessor or multicomputer environment. Both these
concepts suffer from some problems. Distributed Shared Memory (DSM) systems is a new and attractive area of
research recently, which combines the advantages of both shared-memory parallel processors (multiprocessors)
and distributed systems (multi-computers). An overview of DSM is given in the first part of the paper. Later we
have shown how parallel programs can be implemented in DSM environment using Open SHMEM.
This presentation is about a lecture I gave within the "Software systems and services" immigration course at the Gran Sasso Science Institute, L'Aquila (Italy): http://cs.gssi.infn.it/.
http://www.ivanomalavolta.com
Demonstrate a Chosen Ciphertext Attack when Crypto constructs are not used correctly. Detailed steps are given. The slides show how to attack the unauthenticated symmetric encryption in the OFB mode.
Secure application programming in the presence of side channel attacksDharmalingam Ganesan
This document discusses secure programming patterns to harden code against side channel attacks. It describes several patterns such as using random offsets when accessing arrays instead of sequential access, verifying full data before authentication instead of early failure, using non-trivial constants, verifying loop and data integrity with checksums, and choosing constants with maximum hamming distance for fault resistance. Implementing these patterns makes reverse engineering and attacks like fault injection more difficult.
1) The document describes an approach for automated testing of large multi-language software systems using cloud computing.
2) Key aspects of the approach include generating test cases from models of software APIs and interfaces and executing them using tools like JUnit and Selenium.
3) The approach was applied to test portions of NASA software like GMSEC and CFS, and was able to find bugs not discovered with manual testing.
These slides are for novice visitors (e.g., my parents) who are not into CS.
The actual thesis is rooted in dozen two peer-reviewed conference papers. Furthermore, worked with numerous, world-class companies in helping and improving their architecture and quality.
This document discusses interface-implementation contract checking of NASA's OSAL software. It presents static equivalence analysis and static contract checking techniques to find inconsistencies between different OSAL implementations and between code and documentation. Static equivalence analysis identified differences in return codes and other behaviors between POSIX, RTEMS and vxWorks implementations. Static contract checking without formal contracts extracted return codes from code and comments to find mismatches, identifying issues now addressed. The techniques provided lightweight but effective methods to detect errors and inconsistencies in the critical NASA OSAL software.
The document discusses automated test generation for flight software using model-based testing. It describes problems with current manual testing approaches and how model-based testing can generate test cases from models of the system behavior. The Operating System Abstraction Layer (OSAL) used in NASA flight software is presented as a case study. Models of OSAL file system APIs were created and test cases in C were automatically generated from the models to test OSAL functionality.
Model-based Testing of a Software Bus - Applied on Core Flight ExecutiveDharmalingam Ganesan
This document discusses model-based testing of a software bus applied to the Core Flight Executive system. It describes traditional automated testing methods and their limitations. Model-based testing uses a model of the system under test to automatically generate test cases. The authors developed a model of the Core Flight Executive software bus in Spec Explorer to generate test cases covering behaviors like message creation, subscription, and sending. This allowed rigorous testing of the multi-tasking architecture.
An approach for load-time hacking using LD_PRELOAD is presented.
We discuss a simple, yet intriguing, strategy for overcoming the limitations discussed in Part 1 (i.e., the first publication given in the reference) of reverse engineering and exploitation using LD_PRELOAD, a dynamic linking technique. In particular, we relax the need for exit(1) in the main function. The essence of the technique is that both the stack pointer (esp) and the base frame pointer (ebp) are carefully adjusted when the wrapper to the library function is called. The proposed solution allows us to safely return to libc after dynamically modifying the control flow in the wrapper to (library) functions.
Model-based Testing using Microsoft’s Spec Explorer Tool: A Case StudyDharmalingam Ganesan
Spec Explorer is a model-based testing tool that generates test cases from models of the system under test (SUT). The document describes a case study using Spec Explorer to test NASA's GMSEC API, which provides a message bus for component communication. Key aspects of the case study include developing models of the API in Spec Explorer's modeling language, slicing models to focus testing, generating state machines and test cases from the models, and executing the tests on implementations of the API in different programming languages. The automated and parameterized testing identified specification issues and corner cases in the SUT.
Demonstrates remote code execution in the presence of modern OS security features. Stresses the importance of secure programming. Explains the binary reverse engineering process.
Architectural Styles and Case Studies, Software architecture ,unit–2Sudarshan Dhondaley
Architectural styles; Pipes and filters; Data abstraction and object-oriented organization; Event-based, implicit invocation; Layered systems; Repositories; Interpreters; Process control; Other familiar architectures; Heterogeneous architectures. Case Studies: Keyword in Context; Instrumentation software; Mobile robotics; Cruise control; three vignettes in mixed style.
This document discusses unit testing of the Core Flight Software (CFS) product line developed by NASA. It examines how the CFS architecture facilitates or impedes unit testing and how the architecture of test code can be defined based on the system architecture. The CFS uses a unit test architecture with mocks/stubs of dependent modules to enable isolated testing. It finds that defining abstract interfaces and exposing internal details controlled via architectural rules improves testability, and that complete dependency graphs do not inherently imply poor testability.
A Software Factory Integrating Rational Team Concert and WebSphere toolsProlifics
Speakers: Greg Hodgkinson, Prolifics; Andre Tost, IBM
Description: Getting any software development team to effectively scale to meet the needs of a large integration project is actually harder than it sounds. For a large Automotive Retailer based in Florida, this is exactly what they needed to do. They needed a large amount of integration to be built between their brand new Point of Sales system and their new SAP back-end. In this session, you will hear about how tools such as Rational Software Architect and WebSphere Message Broker Toolkit were integrated with a Rational Team Concert-based development environment to set up super efficient software factory employing techniques such as Model-Driven Development and Continuous Integration to help this retailer keep their customers’ wheels on the road.
PrimeSoft Solutions was contracted to develop a UMA Handset Simulator for a client. An 18-member team at PrimeSoft's offshore development center was created to work on the project. The team developed the simulator through requirements analysis, specifications, design, coding, testing, and delivering documentation. The UMA Simulator allows automated testing of UMA functionality and supports complex handover scenarios. PrimeSoft also supports long-term testing of the client's Multi Access Gateway product through manual and automation test plans.
The document describes the Singularity project, which aims to redesign operating system architectures and software stacks to improve dependability and trustworthiness. The key architectural features of Singularity systems are software-isolated processes (SIPs) for isolation, contract-based channels for communication between SIPs, and manifest-based programs (MBPs) for verification of system properties. SIPs provide lightweight process isolation through type safety instead of hardware protection. Communication between SIPs occurs via channels defined by message contracts. MBPs specify the code and behavior of processes.
The document discusses an interpreter and its components. An interpreter translates source code written in one computer language into another target language, often machine code. It performs operations like lexical analysis, parsing, semantic analysis, and code generation. The front end analyzes the source code to build an internal representation and symbol table, while the back end translates the intermediate code into the target language. The document then provides details about the purpose, scope, definition and objectives of a C interpreter project, which will analyze and execute source code line by line to translate it into object code for different computer types. It lists the software and tools used, including the NetBeans IDE.
Fred McLain has over 15 years of experience as a software engineer and technical lead. He currently works at General Dynamics developing software for NASA's satellite communications systems. Previously he has worked on aircraft structural analysis tools at Boeing and developed open source accessibility tools for blind developers. He has extensive experience with Java, REST, distributed systems, and Agile development practices.
Watch the recorded version of this Webinar here:
Curious about Continuous Integration? Tune in!
Continuous Integration (CI), which is a big part of continuous delivery, is the concept of continuously building and testing software using an automated process. We have learned that utilizing CI could help us catch bugs earlier, enable better visibility, reduce repetitive processes, enable the development team to produce deployable products at a moment's notice, and reduce risk overall.
These slides will identify the various levels of continuous integration and delivery with regards to a release maturity of the development team or parent organization.
Ming Liu has over 10 years of experience in embedded software development and testing using languages like C/C++, Python, and Shell scripts. He has worked as a Validation Engineer at Marvell Semiconductor testing WiFi chip features and bringing up new products. Prior to that, he was a Verification Engineer at Wind River testing their VxWorks operating system and a Software Designer at Nortel Networks developing features for their UMTS wireless system.
This document provides an overview of a system software course, including:
- The course will cover compilers, assemblers, linkers, loaders, macro processors, and file/process management under Windows.
- The objective is to gain a deep understanding of how computers work by examining the relationship between system software and machine architecture, and how system software aids in program development and execution.
- Key topics will include an introduction to system software, compilers, loaders, operating systems, and the programming process from coding to running a program.
This document is a resume for Manu Vamadevan seeking an IT position dealing with cutting edge technologies. It summarizes his 6 years of experience in areas like automation, system integration, administration, security and monitoring. He has extensive experience designing and developing middleware applications in Java and customizing various open source tools. He also has strong skills in operations, automation, testing and process management.
10 - Architetture Software - More architectural stylesMajong DevJfu
The Microkernel pattern partitions an operating system into isolated, minimal components that communicate through a small, fixed message-passing interface, allowing components to be developed and upgraded independently while maintaining overall system stability and security.
PrimeSoft developed a fully automated testing and automation suite for a telecommunications client's proprietary carrier grade Linux operating system. This helped reduce development time and improve quality by automating testing for new modules, drivers, and customizations across hardware architectures. PrimeSoft created an automation framework, automated test suites testing all OS features, and integrated an automated build/release process running the test suites. This provided 100% automated testing, stable software releases, and earlier fault detection for lower errors and higher quality.
Sonar is an open source code quality management platform that analyzes code to check for bugs, vulnerabilities, and maintainability issues. It covers seven axes of code quality including architecture, design, comments, coding rules, potential bugs, complexity, and unit tests. Sonar provides centralized quality management across all projects, with metrics, alerts, and trends over time. Developers can integrate it with build tools like Maven to continuously analyze code quality.
The document discusses various architectural styles and patterns. It describes architectural styles like layered, call/return, virtual machine, data-flow, data-centered, and independent components. It also discusses architectural patterns within these styles, such as main program/subroutine, object-oriented, layered, blackboard, microkernel, and middleware. Common middleware architectures like CORBA and COM are also summarized.
The document proposes creating pre-configured CentOS cloud images that can be deployed easily on various cloud vendors and ecosystems. The images would include auto-scaling storage, ability to scale to 64 nodes, be vendor neutral in format, and include a unified CLI for deployment, monitoring, and management. The deliverables would be a set of instance metadata files, a build and testing plan, testing instances using Jenkins, and user documentation on the CentOS cloud images and services.
This document discusses the key success factors for automating the migration of large business applications from Cobol to Java. It describes Eranea's process for automatically transcoding Cobol code into semantically equivalent Java code using their NeaTranscoder tool. Testing ensures the legacy and new systems perform identically. A progressive migration allows switching components incrementally while maintaining full functionality. Automation, iso-functionality testing, and progressive migration are identified as key success factors for large-scale automated migration projects.
Sonar is an open source platform that manages code quality. It covers seven axes of code quality including architecture, design, comments, coding rules, potential bugs, complexity, and unit tests. Sonar allows continuous analysis and measurement of code quality for many languages. It integrates with tools like Clover, Cobertura, PMD, Checkstyle, and FindBugs to analyze code quality.
The story of SonarQube told to a DevOps EngineerManu Pk
SonarQube is a open source code quality management platform. This talk focuses on the need, setup, CI Infrastructure and administration of the SonarQube to the DevOps community.
"OpenHPC is a collaborative, community effort that initiated from a desire to aggregate a number of common ingredients required to deploy and manage High Performance Computing (HPC) Linux clusters including provisioning tools, resource management, I/O clients, development tools, and a variety of scientific libraries. Packages provided by OpenHPC have been pre-built with HPC integration in mind with a goal to provide re-usable building blocks for the HPC community. Over time, the community also plans to identify and develop abstraction interfaces between key components to further enhance modularity and interchangeability. The community includes representation from a variety of sources including software vendors, equipment manufacturers, research institutions, supercomputing sites, and others."
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Guaranteed Component Assembly with Round Trip Analysis for Energy Efficient H...Ákos Horváth
The document discusses the CONCERTO project, which builds upon the CHESS project to further develop model-driven engineering techniques for designing multi-concern software components across several domains including telecom, aerospace, automotive, petroleum, and medical. The project aims to enhance the multi-concern component methodology and toolset defined in CHESS to support additional domains like telecare through techniques such as property-preserving implementation, model execution, safety modeling, and support for multicore targets and resource partitioning. A telecare demonstrator is presented as an initial application of the round-trip modeling and analysis approach.
Similar to Architecture Analysis of Systems based on Publish-Subscribe Systems (20)
The document discusses serialization and deserialization security vulnerabilities. It provides an overview of serialization and deserialization, how attackers can exploit them, and some best practices to prevent exploits. Specifically, it demonstrates how the .NET BinaryFormatter can be insecure by allowing arbitrary code execution through deserialization of untrusted data streams containing unexpected types or callbacks. The presentation recommends avoiding BinaryFormatter and validating serialized data to prevent attacks.
This document discusses reverse architecting software by extracting relationships from source code using relation algebra. It describes extracting relations from code without compiling or linking, storing them in a database, and applying relation algebra operations like join and inverse to abstract the relations. The abstracted relations can then be visualized as graphs or tables to understand aspects of the software architecture like inter-task communication and message queue usage. Reverse architecting is challenging but relation algebra can help reformulate many analysis questions and filter irrelevant data to meet analysis goals.
The document summarizes how predictable random number generators like rand() can be exploited to identify cryptographic keys. It shows that rand() has a predictable behavior based on its seed value. An attacker who knows the time of key generation can initialize rand() with seeds from that time interval and generate a small list of potential keys that need to be tried. As a solution, it recommends using the more secure random number generator from /dev/urandom which is less predictable.
We study the behavior of the RSA trapdoor function by repeatedly encrypting the ciphertext sent over the public channel. We discuss the problem of finding a cycle in order to reverse the plaintext from the given ciphertext. Simple demos and algorithms/python programs are also presented. While the attack is not necessarily practical, it is educational to learn how the RSA trapdoor function behaves.
We look into the nitty-gritty details of the RSA key generation algorithm. We study how RSA can be exploited when the public exponent e is not chosen carefully. We examine why many digital certificates use e=65537. We also experiment with Hastad's broadcast attack for short RSA exponents in particular.
We study the internal structure of the SRP key exchange protocol and experiment with it. SRP establishes a shared encryption key between communicating parties using passwords that were shared out-of-band. We perform basic cryptanalysis of SRP using open-source implementations. We present a demo of how SRP was compromised due to an implementation bug, allowing the attacker to login without the password. The author of the Go-SRP library promptly fixed the issue on the very same day we reported the vulnerability.
We allow Eve to modify DH parameters as well as public keys of Alice and Bob. This allows Eve to derive the secret key and break the DH crypto system. We demonstrate that the DH key exchange algorithm should not be used without digital signatures.
This was an invited talk at the Central Middle School, Maryland. Without going into a lot of math, I try to explain the fundamental key exchange problem. It was a blast. 8th graders enjoyed it as much as I enjoyed it.
Can we reveal the RSA private exponent d from its public key <e, n>? We study this question for two specific cases: e = 3 and e = 65537. Using demos, we verify that RSA reveals the most significant half of the private exponent d when the public exponent e is small. For example, for 2048-bit RSA, the most significant 1024 bits are revealed!
Computing the Square Roots of Unity to break RSA using Quantum AlgorithmsDharmalingam Ganesan
We study the problem of finding the square roots of unity in a finite group in order to factor composite numbers used in RSA. We implemented Peter Shor’s algorithm to find the square root of unity. Experimental results showed that finding the square roots of unity in a finite group multiplicative group is “hard”.
We experiment with Wiener's attack to break RSA when the secret exponent is short, meaning it is smaller than one quarter of the public modulus size. We discuss cryptanalysis details and present demos of the attack. Our very minor extension of Wiener's attack is also discussed.
If we have an RSA 2048 bits configuration, but our private exponent d is only about 512 bits, then the above attack breaks RSA in a few seconds.
This work uses Continued Fractions to derive the private keys from the given public keys. It turned out that one can derive the private exponent d by approximating it as a ratio of e/n, both are public values.
In a default settings of standard RSA libaries, this attack and my minor extension are not relevant (to the best of our knowledge). However, if we configure our library to choose a very large public encryption exponent e, then our private decryption exponent d could be short enough to mount an attack.
An RSA private key is made of a few private variables. We analyze how these private variables are chained together. Further, we study if one of the private variables is leaked, can we derive the other private variables? Demos of the algorithms are also provided.
This document analyzes the security implications of sharing the same RSA modulus n between two users. It presents three algorithms that an attacker could use to break RSA encryption if the public keys for two users share the same n value. Algorithm 1 works if the public exponents are relatively prime. Algorithm 2 works for small public exponents by factoring n. Algorithm 3 directly factors n from the private exponent. The conclusion is that RSA is breakable if n is not unique per user.
The slides demonstrate how to reverse the plaintext from the RSA encrypted ciphertext using an oracle that answers the question: is the last bit of the message 0 or 1?
This document describes an RSA two-person game designed to demonstrate how an adversary could exploit the homomorphic property of raw RSA encryption to break the system. It involves a challenger generating an RSA public/private key pair and encrypting a secret message. The adversary is able to obtain encryptions of arbitrary messages and uses the homomorphic property that the product of ciphertexts corresponds to the product of plaintexts to deduce the secret. Through a series of chosen plaintext/ciphertext queries, the adversary is able to compute the secret plaintext and win the game. The goal is to understand the vulnerabilities in raw RSA and how padding can strengthen the system.
The slides demonstrate how to break RSA when used incorrectly without integrity checks. The man-in-the-middle is allowed to edit the RSA public exponent e in such a way that the Extended Euclidean Algorithm can be employed to reconstruct the plaintexts from the given ciphertexts.
Slides demonstrate how to break RSA when no padding is applied. I replicated the meet-in-the-middle attack discussed in the existing Crypto literature.
20. Acronyms
• AFRL – Air Force Research Laboratory
• APL – Applied Physics Laboratory
• ARC – Ames Research Center
• CESE – Center for Experimental Software
Engineering
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21. Acronyms (2)
• CHIPS - Cosmic Hot Interstellar Plasma
Spectrometer
• CLARREO - Climate Absolute Radiance
and Refractivity Observatory
• COTS – Commercial Off-The-Shelf
• DSILCAS – Distributed System Integrated
Lab Communications Adapter Set
• Dyn-SAVE – Dynamic SAVE
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22. Acronyms (3)
• GLAST - Gamma-ray Large Area Space
Telescope
• GMSEC – Goddard Mission Services
Evolution Center
• GOTS – Government Off-The-Shelf
• GPM - Global Precipitation Measurement
• GSFC – Goddard Space Flight Center
• IV& V – Independent V & V
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23. Acronyms (4)
• JSC – Johnson Space Center
• LADEE - Lunar Atmosphere and Dust
Environment Explorer
• LDCM - Landsat Data Continuity Mission
• LRC - Langley Research Center
• LRO - Lunar Reconnaissance Orbiter
• MMOC – Multi-Mission Operations Center
• MMS - Magnetospheric MultiScale
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24. Acronyms (5)
• MSFC - Marshall Space Flight Center
• RBSP – Radiation Belt Storm Probes
• SAVE – Software Architecture
Visualization and Evaluation
• SDO – Solar Dynamics Observatory
• TRMM – Tropical Rainfall Measuring
Mission
• V & V – Verification and Validation
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