'Feistel network' presentation slideshows

Feistel network - PowerPoint PPT Presentation

Introduction to Security

Introduction to Security

Introduction to Security. Attacks. Interception Interruption Modification Fabrication. Interception (eavesdropping). Unauthorized party gains access to service or data Example: Wiretapping to capture data into a network and coping of files. Interruption (denial of service).

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583 views • 50 slides
L1.2. An Introduction to Block Ciphers

L1.2. An Introduction to Block Ciphers

L1.2. An Introduction to Block Ciphers. Rocky K. C. Chang, February 2013. Outline. Product and iterated ciphers A simple substitution-permutation network DES and AES Modes of operations Cipher block chaining How to ensure message integrity? How to increase the security of DES?.

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621 views • 49 slides
Feistel Networks made Public, and Applications.

Feistel Networks made Public, and Applications.

Feistel Networks made Public, and Applications. Yevgeniy Dodis Prashant Puniya. L. R. f. Round function. Round values. f. Round function output. S. T. Feistel Network. Construction of a permutation on 2n bits from a n ?n bit function f . Easily invertible.

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451 views • 38 slides
Feistel Networks made Public, and Applications.

Feistel Networks made Public, and Applications.

Feistel Networks made Public, and Applications. Yevgeniy Dodis Prashant Puniya. L. R. f. Round function. Round values. f. Round function output. S. T. Feistel Network. Construction of a permutation on 2n bits from a n ?n bit function f . Easily invertible.

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466 views • 38 slides
Computer Security CS 426 Lecture 4

Computer Security CS 426 Lecture 4

Computer Security CS 426 Lecture 4. Cryptography: Block Ciphers and Encryption Modes. Why Block Ciphers?. One thread of defeating frequency analysis Use different keys in different locations Example: one-time pad, stream ciphers Another way to defeat frequency analysis

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274 views • 17 slides
Blowfish

Blowfish

Blowfish. A widely used block cipher. Blowfish. Designed by Bruce Schneier (1993) A variant of it (Twofish) was an AES finalist candidate 64-bit block size, 16-round Feistel network structure. Variable key size: 32-448 bits Key-dependent S-Boxes. Blowfish Feistel Structure.

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167 views • 9 slides
Feistel Model

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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191 views • 6 slides
Feistel Model

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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185 views • 6 slides
Clicker Questions

Clicker Questions

Clicker Questions. Jan 31. DES is a A: block cipher B: stream cipher C: one-time pad. A Feistel network allows you to A: Encrypt in parallel B: Avoid weak keys C: Reuse same implementation for encryption & decryption. A brute-force search against double-DES takes how many steps?

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178 views • 4 slides

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