'Round function' diaporamas de présentation

Chapter Five: Functions

Chapter Five: Functions. Chapter Goals. To be able to implement functions To become familiar with the concept of parameter passing To develop strategies for decomposing complex tasks into simpler ones To be able to determine the scope of a variable To learn how to think recursively.

889 views • 88 slides

What is a block cipher?

Online Cryptography Course Dan Boneh. Block ciphers. What is a block cipher?. Block ciphers: crypto work horse. n bits. n bits. E, D. PT Block. CT Block. Key. k bits. Canonical examples: 3DES: n= 64 bits, k = 168 bits

802 views • 65 slides

Chapter-2

Chapter-2. Conventional Encryption Techniques BY:- H.M.Patel. Block Cipher Principles. . Block cipher :- Block cipher technique involves encryption of one block of text at a time. Decryption also takes one block of encrypted text at a time.

723 views • 44 slides

Windows Programming with Java

585 views • 39 slides

Measurement in Scientific Study and Uncertainty in Measurement

Lecture #3. Measurement in Scientific Study and Uncertainty in Measurement. Chemistry 142 B James B. Callis, Instructor Autumn Quarter, 2004. Precision and Accuracy Errors in Scientific Measurements. Precision - Refers to reproducibility or how close the

559 views • 26 slides

EFV Firepower Briefing

516 views • 26 slides

Block Ciphers

Block Ciphers. Block Ciphers. Modern version of a codebook cipher In effect, a block cipher algorithm yields a huge number of codebooks Specific codebook determined by key It is OK to use same key for a while Just like classic codebook Initialization vector (IV) is like additive

371 views • 23 slides

Cryptography CS 555

Cryptography CS 555. Topic 9: Block Cipher Construction & DES. Outline and Readings. Outline Substitution-Permutation Networks Feistel networks DES Readings: Katz and Lindell: 5.1,5.2,5.3. Why Block Ciphers?. Another way to defeat frequency analysis

323 views • 22 slides

Chapter 5 Selected Single-Row Functions

251 views • 19 slides

Foundations of Network and Computer Security

274 views • 17 slides

Foundations of Network and Computer Security

276 views • 16 slides

Objective 7.03 Apply Built-in Math Class Functions

259 views • 9 slides

Objective 7.03 Apply Built-in Math Class Functions

Objective 7.03 Apply Built-in Math Class Functions. Computer Programming I. Objective/Essential Standard. Essential Standard 7.00 Apply Advanced Logic Indicator 7.03 Apply Built-in Math Class Functions (3%). Math Class Functions.

203 views • 9 slides

Hard sums

201 views • 6 slides

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

188 views • 6 slides