Wap Security Arch Presentation
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The document discusses security models and architectures for the Wireless Application Protocol (WAP). It describes various approaches for authentication, confidentiality, and authorization between mobile devices, WAP gateways, and content providers. These include using WTLS to provide encryption and authentication between devices and gateways, implementing a Wireless Identity Module (WIM) for secure storage of keys on devices, and controlling access to WAP content through WML and WMLScript.
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This document discusses distributed operating systems and CPU scheduling. It covers basic concepts of CPU scheduling like processes, context switching, and dispatching. It then discusses different scheduling algorithms like first-come first-served, shortest job first, priority scheduling, and round robin. It also covers multiple processor scheduling, real-time scheduling, and algorithm evaluation. Deadlocks are discussed including characterization, handling methods like prevention, avoidance, and detection. Memory management techniques like swapping, paging, segmentation and their implementation are also summarized.
Lecture28 tsp
The Traveling Salesman Problem (TSP) involves finding the minimum cost tour that visits each customer exactly once and returns to the starting depot. Key heuristics to solve the TSP include nearest neighbor, insertion methods, and 2-opt exchanges. The Vehicle Routing Problem (VRP) extends the TSP by routing multiple vehicles of limited capacity from a central depot to serve customer demands. Common heuristics for the VRP include savings algorithms and sweep methods.
Multiple Access in wireless communication
This document discusses multiple access techniques in wireless communication. It describes several techniques including Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), and Space Division Multiple Access (SDMA). It also covers packet radio access methods like ALOHA, slotted ALOHA, and Carrier Sense Multiple Access (CSMA). Each technique allows multiple users to share wireless spectrum resources simultaneously through dividing access in frequency, time, code, or space.
Ccleaner presentation
this is the presentation i have made about ccleaner (software that is used to clean the system's and make it run fast n smoother
optimization of DFA
The document discusses methods for minimizing deterministic finite automata (DFAs). It explains that states can be eliminated if they are unreachable, dead, or non-distinguishable from other states. The partitioning algorithm is described as a method for finding equivalent states that go to the same partitions under all inputs. The algorithm is demonstrated on a sample DFA, merging equivalent states into single states until no further merges are possible, resulting in a minimized DFA. The Myhill-Nerode theorem provides another approach using a state pair marking technique to identify indistinguishable states that can be combined.
Distributed shred memory architecture
Distributed shared memory (DSM) is a memory architecture where physically separate memories can be addressed as a single logical address space. In a DSM system, data moves between nodes' main and secondary memories when a process accesses shared data. Each node has a memory mapping manager that maps the shared virtual memory to local physical memory. DSM provides advantages like shielding programmers from message passing, lower cost than multiprocessors, and large virtual address spaces, but disadvantages include potential performance penalties from remote data access and lack of programmer control over messaging.
Distributed computing
Distributed operating systems present users with an integrated computing platform that hides individual computers. They control all nodes in a network and allocate resources without user involvement. Distributed OS examples include cluster computer systems, V system, and Sprite. Middleware implements network-wide programming abstractions like RPC, event distribution, and resource discovery. The core OS functionality distributed OSs should provide for middleware includes encapsulation, protection, concurrent processing, and invocation mechanisms.
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More from Ram Dutt Shukla
Shttp
S-HTTP is a secure protocol designed to work with HTTP that provides encryption and authentication. It allows for secure transactions between clients and servers through symmetric and asymmetric cryptography without requiring public key certificates. S-HTTP preserves the existing HTTP model while adding security features like encrypting form data and digital signatures. It supports a variety of cryptographic standards and algorithms to be negotiated between clients and servers.
Web Security
SSL and TLS provide secure communication over the internet using encryption. SSL uses public key encryption to establish a secure connection and exchange keys to encrypt data sent between a client and server. It defines sessions which allow parameters like encryption algorithms to be shared for multiple connections. TLS is an updated version of SSL that uses similar record and handshake protocols. SET is an open standard that uses digital certificates and dual signatures to securely conduct credit card transactions over the internet between cardholders, merchants, issuers and payment gateways.
I Pv6 Addressing
- The document discusses IPv6 addressing formats including 128-bit addresses divided into eight 16-bit blocks written in hexadecimal with colons as delimiters and the ability to suppress leading zeros.
- It describes different types of IPv6 addresses including unicast addresses, link-local addresses, site-local addresses, and special addresses like the unspecified and loopback addresses.
- The process of address autoconfiguration is outlined where a node derives a tentative link-local address, performs duplicate address detection using neighbor solicitation messages, and obtains network prefixes and configuration from router advertisements.
Anycast & Multicast
Anycast is a new address type in IPv6 that refers to one among many interfaces with the same address. It is used to identify sets of routers or servers. Anycast addresses are allocated from unicast space and packets sent to an anycast address are routed to the nearest interface. Multicast addresses use a class D range in IPv4 from 224.0.0.0 to 239.255.255.255 and have a specific format in IPv6 to identify multicast groups and are mapped to Ethernet addresses for multicast transmission.
Congestion Control
TCP uses several algorithms to control congestion:
- Slow start exponentially increases the congestion window after each ACK to probe available bandwidth. It is used when connections are first established or after congestion.
- Congestion avoidance linearly increases the window when no packet loss occurs to avoid overloading the network. It takes over from slow start once the window reaches the slow start threshold.
- Fast retransmit retransmits a lost segment after receiving 3 duplicate ACKs to recover quickly from single losses without waiting for a timeout.
- Fast recovery then adds the retransmitted segment to the window and continues transmission without reducing to slow start, to maintain high throughput during moderate congestion.
Congestion Control
Congestion occurs when routers receive packets faster than they can forward them, causing their queues to fill up. There are two ways routers deal with congestion - by preventing additional packets from entering the congested region until packets can be processed, or by discarding queued packets to make room for new ones. Congestion control techniques like warning bits, choke packets, and load shedding help detect and recover from congestion on a global scale across an entire subnet, while flow control operates on a point-to-point basis between individual senders and receivers.
Retransmission Tcp
TCP uses a retransmission queue and timers to reliably retransmit lost data segments. Each sent segment is placed on the queue and given a retransmission timer. If an acknowledgment is not received before the timer expires, the segment is retransmitted. There are different policies for handling retransmissions of subsequent outstanding segments. TCP also adapts retransmission timers dynamically based on measurements of the round-trip time between devices to account for varying network conditions. The window size advertised by a receiving device controls the amount of outstanding data and affects the sending rate.
Tcp Congestion Avoidance
The document discusses several algorithms used for congestion control in TCP/IP networks, including slow start, congestion avoidance, fast retransmit, fast recovery, random early discard (RED), and traffic shaping using leaky bucket and token bucket algorithms. Slow start and congestion avoidance control the transmission rate by adjusting the congestion window size. Fast retransmit and fast recovery allow quicker retransmission of lost packets without waiting for timeouts. RED proactively discards packets before buffer overflow. Leaky bucket and token bucket algorithms shape traffic flow through use of buffers and tokens to smooth bursts and control transmission rates.
Tcp Immediate Data Transfer
TCP has no knowledge of the structure or purpose of data sent by applications. It treats all data as an unstructured stream of bytes and chooses when and how to send data based solely on the sliding window system. The push function allows applications to immediately send data without waiting for more to accumulate. The urgent function allows applications to send critical data with higher priority than other data by setting the URG flag and urgent pointer field in TCP segments.
Tcp Reliability Flow Control
TCP has two key requirements: reliability through acknowledgments and retransmissions, and flow control to manage data transmission rates. The sliding window mechanism tracks bytes sent and received, and allows the sender to transmit more data as acknowledgments are received by sliding the window. The receive window size can be adjusted by the receiver to control transmission speed and prevent buffer overflows.
Tcp Udp Notes
The document discusses transport layer protocols and their functions. Transport layer protocols like TCP and UDP provide services to applications to allow communication over an internetwork. They are responsible for establishing and maintaining connections between services on different machines and act as a bridge between the needs of applications and the underlying network layer protocols. Transport layer protocols are tightly tied to and designed to work with the specific network layer protocol below them.
Transport Layer [Autosaved]
Transport layer protocols provide services like reliable data transfer and connection establishment between applications on networked devices. They address this need through protocols like TCP and UDP. TCP provides reliable, ordered data streams using mechanisms like three-way handshake, sequence numbers, acknowledgments, retransmissions, flow control via sliding windows, and connection termination handshaking. UDP provides simple datagram transmissions without reliability or flow control.
Transport Layer
Transport layer protocols provide services like reliable data transfer and connection establishment between applications on networked devices. They address this need through protocols like TCP and UDP. TCP provides reliable, ordered data streams using mechanisms like three-way handshake, sequence numbers, acknowledgments, retransmissions, flow control via sliding windows, and connection termination handshaking. UDP provides simple datagram transmissions without reliability or flow control.
T Tcp
T/TCP solves two TCP performance problems for transaction-oriented communications:
1) It bypasses the three-way handshake to reduce latency by including a connection count in packets.
2) It shortens the TIME_WAIT state delay after closing connections to improve transaction rates by including a connection count in FIN packets.
Anycast & Multicast
Anycast is a new address type in IPv6 that refers to one among many interfaces with the same address. It is used to identify sets of routers or servers. Anycast addresses are allocated from unicast space and packets sent to an anycast address are routed to the nearest interface. Multicast addresses use a class D range in IPv4 from 224.0.0.0 to 239.255.255.255 and have a specific format in IPv6 to identify multicast groups and allow delivery of packets to many destinations.
Igmp
IGMP (Internet Group Management Protocol) allows hosts to dynamically join multicast groups and routers to manage delivery of multicast data packets. IGMP version 1 uses query and report messages between routers and hosts to discover which hosts belong to which multicast groups on local networks. Version 2 and 3 added new message types and formats to more efficiently manage group membership and enhance security.
Mobile I Pv6
Mobile IPv6 integrates mobility support directly into IPv6 and offers improvements over Mobile IPv4 such as no need for foreign agents, auto-configuration of care-of addresses, support for multiple care-of addresses, and route optimization as a fundamental part of the protocol. Security measures in Mobile IPv6 include using hash-based message authentication codes and nonces to authenticate nodes and prevent replay attacks during registration and data forwarding.
Mld
MLD is the IPv6 equivalent of IGMPv2 for IPv4. It uses ICMPv6 messages to enable routers to discover the set of multicast addresses for which there are listening nodes on each attached interface. MLD messages include Multicast Listener Query to query for listeners, Multicast Listener Report for listeners to report interest, and Multicast Listener Done for listeners to inform routers they are no longer listening.
Mobility And Mobile I Pv4
Mobile IP allows devices to move between networks while maintaining the same IP address. It uses a home agent and foreign agent to forward data to the device's current location. When a mobile node moves to a new network, it acquires a care-of address and registers this with its home agent so data can be tunneled to it. The home agent intercepts data for the mobile node and encapsulates it for forwarding to the care-of address via direct delivery or through the foreign agent. This allows seamless mobility as the mobile node does not need a new IP address when changing networks.
Multicast Routing Protocols
IP multicasting allows for efficient one-to-many and many-to-many communication on the internet. It uses multicast groups and protocols like IGMP for group management and PIM for multicast routing. PIM supports both source-based trees using flood-and-prune and core-based trees with a rendezvous point to deliver multicast data.
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Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
Pushing the limits of ePRTC: 100ns holdover for 100 days
At WSTS 2024, Alon Stern explored the topic of parametric holdover and explained how recent research findings can be implemented in real-world PNT networks to achieve 100 nanoseconds of accuracy for up to 100 days.
Securing your Kubernetes cluster_ a step-by-step guide to success !
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
20240607 QFM018 Elixir Reading List May 2024
Everything I found interesting about the Elixir programming ecosystem in May 2024
GraphSummit Singapore | The Art of the Possible with Graph - Q2 2024
Neha Bajwa, Vice President of Product Marketing, Neo4j
Join us as we explore breakthrough innovations enabled by interconnected data and AI. Discover firsthand how organizations use relationships in data to uncover contextual insights and solve our most pressing challenges – from optimizing supply chains, detecting fraud, and improving customer experiences to accelerating drug discoveries.
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Large Language Model (LLM) and it’s Geospatial Applications
Large Language Model (LLM) and it’s Geospatial Applications
Essentials of Automations: The Art of Triggers and Actions in FME
Essentials of Automations: The Art of Triggers and Actions in FME
GraphSummit Singapore | Enhancing Changi Airport Group's Passenger Experience...
GraphSummit Singapore | Enhancing Changi Airport Group's Passenger Experience...
Enchancing adoption of Open Source Libraries. A case study on Albumentations.AI
Enchancing adoption of Open Source Libraries. A case study on Albumentations.AI
Why You Should Replace Windows 11 with Nitrux Linux 3.5.0 for enhanced perfor...
Why You Should Replace Windows 11 with Nitrux Linux 3.5.0 for enhanced perfor...
By Design, not by Accident - Agile Venture Bolzano 2024
By Design, not by Accident - Agile Venture Bolzano 2024
Elizabeth Buie - Older adults: Are we really designing for our future selves?
Elizabeth Buie - Older adults: Are we really designing for our future selves?
みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...
Pushing the limits of ePRTC: 100ns holdover for 100 days
Pushing the limits of ePRTC: 100ns holdover for 100 days
Securing your Kubernetes cluster_ a step-by-step guide to success !
Securing your Kubernetes cluster_ a step-by-step guide to success !
GraphSummit Singapore | The Art of the Possible with Graph - Q2 2024
GraphSummit Singapore | The Art of the Possible with Graph - Q2 2024
Wap Security Arch Presentation
- 1. A Survey of WAP Security Architecture Neil Daswani [email_address]
- 7. Basic WAP Architecture Internet Gateway Web Server WTLS SSL