The document contains slides summarizing key concepts in security for distributed systems. It includes figures explaining common names used in security protocols like Alice and Bob, cryptography notations, digital signatures, encryption algorithms like TEA and stream ciphers, and security protocols like TLS, Kerberos, and WEP. Descriptions of public/private key certificates, digital signatures, and encryption standards are provided.
Name a naming mechanism for delay disruption tolerant networkIJCNCJournal
This paper presents the design and implementation of the naming mechanism (NAME), a resource
discovery and service location approach for Delay/Disruption-Tolerant Network (DTN). First discuss the
architecture of NAME mainly including Name Knowledge Base, Name Dissemination, Name Resolution
and Name-based Routing. In the design and implementation of NAME, we introduce the simple namespecifiers
to describe name, the name-tree for name storage and the efficient predicate-based routing
algorithm. Future work is finally discussed for completing NAME and providing APIs for abundant
applications.
AGPM: An Authenticated Secure Group Communication Protocol for MANETsIDES Editor
Secure group communication is a challenging task
with respect to MANET’s, authentication of mobile nodes,
group key establishment and rekeying for secure
information exchange and QoS in data transfer. In this
paper we authenticate the mobile nodes through transitive
signature scheme in the routing phase of AODV protocol.
For a secure group communication we establish a
collaborative group key with the members participating in
the route path to the destination. The nodes are dynamic in
nature, in which any new node can join in the group or
leave the group. Instead of performing individual Rekeying
operations, it is performed at a particular time interval.
Performance of the group communication is compared with
the existing protocols. The analysis is made with respect to
the throughput, rekeying time, delay, overhead and
communication cost. The simulation result shows that our
protocol enjoys greater advantage over other protocols in
the literature.
Optimal Network Locality in Distributed ServicesGwendal Simon
In age of cloud computing, any equipment can become server, e.g. set-top-boxes or access routers. For service providers, a challenge consists in accurately making use of these servers. We address the problem of locating a large service (or content) into these Internet edges so that the delivery to clients is efficient from a networking point of view.
The classic mutual exclusion problem in distributed systems occurs when only one process should access a
shared resource. Various algorithms are proposed in order to solve this problem. When using a permission
based approach which consist in exchanging permission messages to grant access to the critical resource,
less messages should be sent over the network because bandwidth consumption and synchronization delay
should be reduced. Richa, shikha and Pooja proposed an algorithm using nodes logically organized in a
complete binary tree. This algorithm called NTBCBT requires 4log2(N) messages per access to critical
section and a synchronization delay of 3log2(N) for a set of N nodes competing for the critical ressource. In
this paper, we study NTBCBT and we show that this algorithm has problems related with safety, liveness
and scheduling. We improve this algorithm by correcting these weaknesses. Moreover, our algorithm
requires 3log(N) messages per access to critical section and a synchronization delay of 2log(N). This
improvement is due to the removal of useless messages, a reorganization of instructions on each node and
an insertion of access requests using their timestamp.
Name a naming mechanism for delay disruption tolerant networkIJCNCJournal
This paper presents the design and implementation of the naming mechanism (NAME), a resource
discovery and service location approach for Delay/Disruption-Tolerant Network (DTN). First discuss the
architecture of NAME mainly including Name Knowledge Base, Name Dissemination, Name Resolution
and Name-based Routing. In the design and implementation of NAME, we introduce the simple namespecifiers
to describe name, the name-tree for name storage and the efficient predicate-based routing
algorithm. Future work is finally discussed for completing NAME and providing APIs for abundant
applications.
AGPM: An Authenticated Secure Group Communication Protocol for MANETsIDES Editor
Secure group communication is a challenging task
with respect to MANET’s, authentication of mobile nodes,
group key establishment and rekeying for secure
information exchange and QoS in data transfer. In this
paper we authenticate the mobile nodes through transitive
signature scheme in the routing phase of AODV protocol.
For a secure group communication we establish a
collaborative group key with the members participating in
the route path to the destination. The nodes are dynamic in
nature, in which any new node can join in the group or
leave the group. Instead of performing individual Rekeying
operations, it is performed at a particular time interval.
Performance of the group communication is compared with
the existing protocols. The analysis is made with respect to
the throughput, rekeying time, delay, overhead and
communication cost. The simulation result shows that our
protocol enjoys greater advantage over other protocols in
the literature.
Optimal Network Locality in Distributed ServicesGwendal Simon
In age of cloud computing, any equipment can become server, e.g. set-top-boxes or access routers. For service providers, a challenge consists in accurately making use of these servers. We address the problem of locating a large service (or content) into these Internet edges so that the delivery to clients is efficient from a networking point of view.
The classic mutual exclusion problem in distributed systems occurs when only one process should access a
shared resource. Various algorithms are proposed in order to solve this problem. When using a permission
based approach which consist in exchanging permission messages to grant access to the critical resource,
less messages should be sent over the network because bandwidth consumption and synchronization delay
should be reduced. Richa, shikha and Pooja proposed an algorithm using nodes logically organized in a
complete binary tree. This algorithm called NTBCBT requires 4log2(N) messages per access to critical
section and a synchronization delay of 3log2(N) for a set of N nodes competing for the critical ressource. In
this paper, we study NTBCBT and we show that this algorithm has problems related with safety, liveness
and scheduling. We improve this algorithm by correcting these weaknesses. Moreover, our algorithm
requires 3log(N) messages per access to critical section and a synchronization delay of 2log(N). This
improvement is due to the removal of useless messages, a reorganization of instructions on each node and
an insertion of access requests using their timestamp.
OpenSplice DDS enables seamless, timely, scalable and dependable data sharing between distributed applications and network-connected devices. Its technical and operational benefits have propelled adoption across multiple industries, such as Defence and Aerospace, SCADA, Gaming, Cloud Computing, Automotive, etc.
If you want to learn about OpenSplice DDS or discover some of its advanced features, this webcast is for you!
In this two-parts webcast we will cover all the aspects tied to architecting and developing OpenSplice DDS systems. We will look into Quality of Services, data selectors concurrency and scalability concerns.
We will present the brand-new, and recently finalized, C++ and Java APIs for DDS, including examples of how this can be used with C++11 features. We will show how, increasingly popular, functional languages such as Scala can be used to efficiently and elegantly exploit the massive HW parallelism provided by modern multi-core processors.
Finally we will present some OpenSplice specific extensions for dealing very high-volumes of data – meaning several millions of messages per seconds.
Diametrical Mesh of Tree (D2D-MoT) Architecture: A Novel Routing Solution for...IDES Editor
Network-on-chip (NoC) is a new aspect for designing
of future System-On-Chips (SoC) where a vast number of IP
cores are connected through interconnection network. The
communication between the nodes occurred by routing packets
rather than wires. It supports high degree of scalability,
reusability and parallelism in communication. In this paper,
we present a Mesh routing architecture, which is called
Diametrical 2D Mesh of Tree, based on Mesh-of-Tree (MoT)
routing and Diametrical 2D Mesh. It has the advantage of
having small diameter as well as large bisection width and
small node degree clubbed with being the fastest network in
terms of speed. The routing algorithm ensures that the packets
will always reach from source to sink through shortest path
and is deadlock free.
A Novel Technique for Image Steganography Based on DWT and Huffman EncodingCSCJournals
Image steganography is the art of hiding information into a cover image. This paper presents a novel technique for Image steganography based on DWT, where DWT is used to transform original image (cover image) from spatial domain to frequency domain. Firstly two dimensional Discrete Wavelet Transform (2-D DWT) is performed on a gray level cover image of size M × N and Huffman encoding is performed on the secret messages/image before embedding. Then each bit of Huffman code of secret message/image is embedded in the high frequency coefficients resulted from Discrete Wavelet Transform. Image quality is to be improved by preserving the wavelet coefficients in the low frequency sub-band. The experimental results show that the algorithm has a high capacity and a good invisibility. Moreover PSNR of cover image with stego-image shows the better results in comparison with other existing steganography approaches. Furthermore, satisfactory security is maintained since the secret message/image cannot be extracted without knowing decoding rules and Huffman table.
A METHOD FOR ENCRYPTING AND DECRYPTINGWAVE FILESIJNSA Journal
This paper aims at presenting a novel method for encrypting and decrypting wave files. Basically, the target files are sound files. First, the files are fetched, then a two-dimensional matrix of the double data type is created to maintain the values that correspond to the sample range; these values are placed in a
column matrix then they are kept in the two dimensional-matrix already created. The double 2D matrix will be encrypted using matrix multiplication with a private double matrix key [1]. Having been encrypted, the data will be sent in wave file format and decrypted using the same 2D matrix private key.
OpenSplice DDS enables seamless, timely, scalable and dependable data sharing between distributed applications and network-connected devices. Its technical and operational benefits have propelled adoption across multiple industries, such as Defence and Aerospace, SCADA, Gaming, Cloud Computing, Automotive, etc.
If you want to learn about OpenSplice DDS or discover some of its advanced features, this webcast is for you!
In this two-parts webcast we will cover all the aspects tied to architecting and developing OpenSplice DDS systems. We will look into Quality of Services, data selectors concurrency and scalability concerns.
We will present the brand-new, and recently finalized, C++ and Java APIs for DDS, including examples of how this can be used with C++11 features. We will show how, increasingly popular, functional languages such as Scala can be used to efficiently and elegantly exploit the massive HW parallelism provided by modern multi-core processors.
Finally we will present some OpenSplice specific extensions for dealing very high-volumes of data – meaning several millions of messages per seconds.
Diametrical Mesh of Tree (D2D-MoT) Architecture: A Novel Routing Solution for...IDES Editor
Network-on-chip (NoC) is a new aspect for designing
of future System-On-Chips (SoC) where a vast number of IP
cores are connected through interconnection network. The
communication between the nodes occurred by routing packets
rather than wires. It supports high degree of scalability,
reusability and parallelism in communication. In this paper,
we present a Mesh routing architecture, which is called
Diametrical 2D Mesh of Tree, based on Mesh-of-Tree (MoT)
routing and Diametrical 2D Mesh. It has the advantage of
having small diameter as well as large bisection width and
small node degree clubbed with being the fastest network in
terms of speed. The routing algorithm ensures that the packets
will always reach from source to sink through shortest path
and is deadlock free.
A Novel Technique for Image Steganography Based on DWT and Huffman EncodingCSCJournals
Image steganography is the art of hiding information into a cover image. This paper presents a novel technique for Image steganography based on DWT, where DWT is used to transform original image (cover image) from spatial domain to frequency domain. Firstly two dimensional Discrete Wavelet Transform (2-D DWT) is performed on a gray level cover image of size M × N and Huffman encoding is performed on the secret messages/image before embedding. Then each bit of Huffman code of secret message/image is embedded in the high frequency coefficients resulted from Discrete Wavelet Transform. Image quality is to be improved by preserving the wavelet coefficients in the low frequency sub-band. The experimental results show that the algorithm has a high capacity and a good invisibility. Moreover PSNR of cover image with stego-image shows the better results in comparison with other existing steganography approaches. Furthermore, satisfactory security is maintained since the secret message/image cannot be extracted without knowing decoding rules and Huffman table.
A METHOD FOR ENCRYPTING AND DECRYPTINGWAVE FILESIJNSA Journal
This paper aims at presenting a novel method for encrypting and decrypting wave files. Basically, the target files are sound files. First, the files are fetched, then a two-dimensional matrix of the double data type is created to maintain the values that correspond to the sample range; these values are placed in a
column matrix then they are kept in the two dimensional-matrix already created. The double 2D matrix will be encrypted using matrix multiplication with a private double matrix key [1]. Having been encrypted, the data will be sent in wave file format and decrypted using the same 2D matrix private key.
Overview of Java RMI remoting.
RMI is a lightweight Java technology that provides access to remote methods, similar to RPC, but object-oriented. RMI basically provides remote object access for a client and object registration for servers.
RMI is both a Java API (java.rmi.* package) as well as a transport protocol definition for transporting RMI calls through a network.
RMI is a Java technology since it requires that client and server objects run in a JVM (Java Virtual Machine). By using IIOP as transport protocol, however, it is possible to connect RMI-clients to non-Java server objects (e.g. CORBA).
RMI defines the elements client, server, RMI registry where servers register their services and possibly a plain vanilla web server that can be used by clients to dynamically load object classes to access servers.
International Journal of Computational Engineering Research(IJCER) ijceronline
nternational Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
Module 6
Advanced Networking
Security problems with internet architecture, Introduction to Software defined networking, Working of SDN, SDN in data centre, SDN applications, Data centre networking, IoT.
International Journal of Research in Engineering and Science is an open access peer-reviewed international forum for scientists involved in research to publish quality and refereed papers. Papers reporting original research or experimentally proved review work are welcome. Papers for publication are selected through peer review to ensure originality, relevance, and readability.
We rely on secrets such as safe combinations, PIN codes, computer passwords, etc. But so many things happen to lose secretes.
1. Secrets can be lost.
2. Documents get destroyed.
3. Hard disks fail
4. People forget
5. People leave companies,
6. people die...
One way to avoid such problems :-
Divide secret data (D) in to pieces (n)
* Knowledge of some pieces (k) enables to derive secret data (D)
* Knowledge of any pieces (k-1) makes secret data (D) completely undetermined.
Such a scheme is called a (k, n) threshold scheme.
This presentation provides a in depth view of Shamir's Secret Sharing Scheme.
2024.03.22 - Mike Heddes - Introduction to Hyperdimensional Computing.pdfAdvanced-Concepts-Team
Presentation in Science Coffee of the Advanced Concepts Team of the European Space Agency.
Date: 22.03.2024
Speaker: Mike Heddes (University of California, Irvine)
Topic: Introduction to Hyperdimensional Computing
Abstract:
Hyperdimensional computing (HD), also known as vector symbolic architectures (VSA), is a computing framework capable of forming compositional distributed representations. HD/VSA forms a "concept space" by exploiting the geometry and algebra of high-dimensional spaces. The central idea is to represent information with randomly generated vectors, called hypervectors. Together with a set of operations on these hypervectors, HD/VSA can represent compositional structures, which, in turn, enables features such as reasoning by analogy and cognitive computing. In this introductory talk, I will introduce the high-dimensional spaces and the fundamental operations on hypervectors. I will then cover applications of HD/VSA such as reasoning by analogy and graph classification.