'Block cipher' diaporamas de présentation

IEEE C802.20-04/ 56r1

IEEE C802.20-04/ 56r1. IEEE C802.20-04/33. On Security Issues In Wireless Communications Systems. Mithat C. Dogan ArrayComm, Inc. 2480 North First Street, Suite 200. San Jose, CA 95131-1014. Agenda. Agenda. Review symmetric key encryption algorithms:

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SYMMETRIC CIPHERS

SYMMETRIC CIPHERS. Contents. Classical encryption techniques Block ciphers and the data encryption standard Basic concepts in number theory and finite fields Advanced encryption standard Block cipher operation Pseudorandom number generation and stream ciphers.

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IE MS5710 Symmetric Ciphers

IE MS5710 Symmetric Ciphers. 22 January 20 13 Prof. CHAN Yuen-Yan, Rosanna Department of Information Engineering The Chinese University of Hong Kong. Cryptography. can characterize cryptographic system by: type of encryption operations used substitution transposition product

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CSCE 727 Cryptography

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Sympatric Encryption

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Network Security Essentials

Network Security Essentials. Fifth Edition by William Stallings. Chapter 2. Symmetric Encryption and Message Confidentiality.

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Block Cipher Transmission Modes

Block Cipher Transmission Modes. CSIS 5857: Encoding and Encryption. Transmitting Encrypted Data. Encrypted data transmitted one block at a time 64 or 128 bits Problems: A large message (such as a database) may consist of thousands of blocks Each encrypted with same key

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Cryptography CS 555

Cryptography CS 555. Topic 10: Block Cipher Security & AES. Outline and Readings. Outline Attacks against block ciphers Differential cryptanalysis Linear cryptanalysis Double & triple encryption AES Readings: Katz and Lindell: 5.4, 5.5, 5.6. Block Cipher Security. Two attack objectives

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Block Cipher Operation

Block Cipher Operation. Raj Jain Washington University in Saint Louis Saint Louis, MO 63130 Jain@cse.wustl.edu Audio/Video recordings of this lecture are available at: http://www.cse.wustl.edu/~jain/cse571-11/. Overview. Double DES, Triple DES, DES-X Encryption Modes for long messages:

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Chapter 12: Hash and MAC Algorithms

Chapter 12: Hash and MAC Algorithms Fourth Edition by William Stallings Lecture slides by Lawrie Brown (modified by Prof. M. Singhal, U of Kentucky) Hash and MAC Algorithms Hash Functions condense arbitrary size message to fixed size by processing message in blocks

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Chapter 12: Hash and MAC Algorithms

Fourth Edition by William Stallings Lecture slides by Lawrie Brown (modified by Prof. M. Singhal, U of Kentucky). Chapter 12: Hash and MAC Algorithms. Hash and MAC Algorithms. Hash Functions condense arbitrary size message to fixed size by processing message in blocks

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CS255

CS255. Programming Assignment #1. Programming Assignment #1. Due: Friday Feb 10 th (11:59pm) Can use extension days Can work in pairs One solution per pair Test and submit on Sweet Hall machines SCPD students: get SUNet ID! sunetid.stanford.edu. Big Picture.

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Proposal of MISTY1 as a Block Cipher of Cipher Suites in TLS

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Cryptography Evolution

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Chapter 6

Chapter 6. Block Cipher Operation. Double DES. Meet-in-the-Middle Attack. Triple-DES with Two-Keys. Obvious counter to the meet-in-the-middle attack is to use three stages of encryption with three different keys

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RTP Encryption for 3G Networks

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Encrypting with Block Ciphers

Encrypting with Block Ciphers. CS 470 Introduction to Applied Cryptography Instructor: Ali Aydin Selcuk. How to Encrypt with a Block Cipher?. Electronic Codebook (ECB) Mode: The naive way.

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Authenticating with Block Ciphers

Authenticating with Block Ciphers. CS 470 Introduction to Applied Cryptography Instructor: Ali Aydin Selcuk. Message Authentication Codes (MAC). A keyed checksum of the message. Sender of a message m computes c = MAC K (M) and sends (M,c) to the receiver.

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Feistel Model

CS 465. Feistel Model. Last Updated: Aug 27, 2013. Feistel Cipher Structure. Described by Horst Feistel (IBM) in 1973 Many symmetric encryption algorithms use this structure DES, IDEA, Blowfish, RC6, MARS, Twofish Not AES Substitution-permutation network Block cipher

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Example of linear cryptanalysis

Example of linear cryptanalysis. We shall apply linear cryptanalysis against a block cipher based only on applying a fixed permutation to each block and XOR of each block with a fixed binary array. Suppose the following known plaintext blocks 0000 1000 1100 0110 1111

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