PPT-Symmetric Key Block Ciphers

Substitution Classical Ciphers Transposition Data Encryption Standard 1977 Modern Cryptography New Directions in Cryptography 1976 Symmetric key block ciphers Public key ciphers Stream ciphers. Parents as well as students will be made aware of this help for our students Students will be encouraged to attend to get the extra help they may need Schedule is on School Calendar Whenever possibl e we will schedule Homerooms during one of our Wed Modes of operation:. many time key (CBC). Online Cryptography Course Dan Boneh. Example applications. : . 1. File systems: Same AES key used to encrypt many files.. 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 . Set of . slides . 4. Dr Alexei Vernitski. Another useful example of a Cipher. Vigenere’s. cipher (16. th. century). It is like Caesar’s cipher. However, instead of one number acting as a key, a sequence of numbers is used, one for each letter of the plaintext. Pseudorandom Generators. Online Cryptography Course Dan Boneh. Review. Cipher over (K,M,C): a pair of “efficient” . algs. (. E. , . D. ) . s.t.. . ∀ . Demijan. . Klinc. * . Carmit. . Hazay. † . Ashish. . Jagmohan. **. Hugo . Krawczyk. ** . Tal Rabin. **. * . Georgia . Institute of . Technology. ** . IBM T.J. Watson Research . Labs. † . 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). Symmetric-key algorithms. use the same cryptographic keys for both encryption of plaintext and decryption of ciphertext. split into:. stream ciphers. block ciphers. Stream cipher. key and algorithm are applied to each binary digit in a data stream, one bit at a time. 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. Presented By:. Rahul. M.Tech. CSE, GBPEC . Pauri. Contents. Introduction. Symmetric memory architecture. Advantages. The limitations. Addressing the limitations. Problem with more than one copy in caches. 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. DES, AES . TEK4500. 01.09.2020 . Håkon Jacobsen. hakon.jacobsen@its.uio.no. Ideal solution: secure channels. 2. Internet. Alice. Bob. M. Adversary. Security goals:. Data privacy: . adversary should not be able to read message M . Online Cryptography Course Dan Boneh. Symmetric Ciphers: definition. Def. : a . cipher. defined over . . is a pair of “efficient” . algs. (. E. , . D. Rajat Mittal. (IIT Kanpur) . Boolean functions. or . Central object of study in Computer Science. AND, OR, Majority, Parity. With real range, real vector space of dimension . Parities for all . , .