PPT-Ciphers

Dan Fleck CS 469 Security Engineering These slides are modified with permission from Bill Young Univ of Texas Coming up What is Good Encryption 1 1 1 What is Good Encryption The following are suggested as tests of worth for . For symmetric key ciphers K K Only Alice and Bob knows K a or K Eve has access to E D and the Communication Channel but does not know the key K or K Communication Channel Message Message Eve Alice Bob brPage 3br brPage 4br Yes The n bit inputs and Configuration. WebSec. 101. mike.andrews@foundstone.com. mike@mikeandrews.com. Intro Music by . DoKashiteru. via . CCMixter. Nothing in isolation. Network. Operating System. Libraries. Web server. CSE 5351: Introduction to Cryptography. Reading assignment:. Chapter 2. Chapter 3 (sections 3.1-3.4). You may skip proofs, but are encouraged to read some of them.. 2. Computational Difficulty (One-Way Functions). Chapter 2. Fifth Edition. by William Stallings . Lecture slides by . Lawrie. . Brown. Modified by Richard Newman. Chapter 2 – . Classical Encryption. Techniques. "I am fairly familiar with all the forms of secret writings, and am myself the author of a trifling monograph upon the subject, in which I analyze one hundred and sixty separate ciphers," said Holmes.. Rice ELEC 528/ COMP 538 . Farinaz Koushanfar. Spring 2009. 2. Summary. Substitution ciphers. Permutations. Making good ciphers . DES. AES. Slides are courtesy of Leszek T. Lilien from WMich. http://www.cs.wmich.edu/~llilien/. Modes of operation:. many time key (CTR). Online Cryptography Course Dan Boneh. Example applications. : . 1. File systems: Same AES key used to encrypt many files.. The One Time Pad. Online Cryptography Course Dan Boneh. Symmetric Ciphers: definition. Def. : a . cipher. defined over . . is a pair of “efficient” . algs. Stream ciphers are semantically secure. Online Cryptography Course Dan Boneh. Goal: secure PRG ⇒ semantically secure stream cipher. Stream ciphers are semantically secure. CSE 5351: Introduction to Cryptography. Reading assignment:. Chapter 3 . Read sections 3.1-3.2 first (skipping 3.2.2). 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. Pseudorandom Generators and Stream Ciphers. Session 4. Contents. Linear cryptanalysis. Differential cryptanalysis. 2. /48. Linear cryptanalysis. Known plaintext attack. The cryptanalyst has a set of plaintexts and the corresponding ciphertexts. Information and Network Security. . Dr. . Hadi. AL . Saadi. The objective of this chapter is to illustrate the principles of . modern symmetric ciphers. .. The . Data Encryption Standard. (. DES. Online Cryptography Course Dan Boneh. Block ciphers: crypto work horse. E, D. CT Block. n. bits. PT Block. n. bits. Key. k . bits. Canonical examples:. 3DES: n= 64 bits, k = 168 bits. Presented by: Andrew F. Conn. Lecture #12: Solving Congruence's and Cryptography. October 10. th. , 2016. Today. ’. s Topics. More on divisibility and remainders.. Modulo Inverse. Chinese Remainder Theorem. Substitution. Classical Ciphers. Transposition. Data Encryption Standard 1977. Modern Cryptography. “New Directions in Cryptography” 1976. Symmetric . key block ciphers. Public key ciphers. Stream ciphers.