PPT-Public key ciphers 1

Session 5 Contents Intractability and NP completness Primality testing Factoring large composite numbers Complexity of RSA Security of RSA 2 67 Intractability and NP completness A problem. Pseudorandom Generators. Online Cryptography Course Dan Boneh. Review. Cipher over (K,M,C): a pair of “efficient” . algs. (. E. , . D. ) . s.t.. . ∀ . 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). 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/. Stream ciphers are semantically secure. Online Cryptography Course Dan Boneh. Goal: secure PRG ⇒ semantically secure stream cipher. Stream ciphers are semantically secure. Lecture 9: Cryptography. 2. Topics. Introduction. Definitions and Terminology. Steganography. Transposition Ciphers. Substitution Ciphers. 3. Introduction. Throughout history, people have had the need to send messages to other people . 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. Algorithms. Scott Chappell. What is Cryptography?. Definition: the art of writing or solving codes. Basic Encryption Methods. Caesar Shift. Simple Substitution Cipher. Fun to use, but are easily cracked by computers and even by humans. Block Ciphers. Slides Original Source:. M. Stamp, “Information Security: Principles and Practice,” John Wiley. C. . Paar. and J. Pelzl, “Understanding Cryptography – A Textbook for Students and Practitioners,” . David . Brumely. Carnegie Mellon University. Credits:. Slides originally designed by David . Brumley. . . Many. other slides are from Dan . Boneh’s. June 2012 . Coursera. . crypto class.. What is a block cipher?. Using Linear Algebra. Brian Worthington. University of North Texas. MATH 2700.002. 5/10/2010. Hill Ciphers. Created by Lester S. Hill in 1929. Polygraphic Substitution Cipher. Uses Linear Algebra to Encrypt and Decrypt. Public key encryption from Diffie -Hellman The ElGamal Public-key System Online Cryptography Course Dan Boneh Recap: public key encryption: (Gen, E, D) E D 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. Slides Original Source:. M. Stamp, “Information Security: Principles and Practice,” John Wiley. C. . Paar. and J. Pelzl, “Understanding Cryptography – A Textbook for Students and Practitioners,” .