PPT-Public key encryption from Diffie -Hellman The ElGamal Public-key System

Public key encryption from Diffie Hellman The ElGamal Publickey System Online Cryptography Course Dan Boneh Recap public key encryption Gen E D E D. Raymond Flood. Gresham Professor of Geometry. Overview. Key terms and guidelines. Caesar ciphers. Substitution cipher. Polyalphabetic cipher. Enigma. Modern . ciphers. Stream ciphers. Block ciphers. Diffie. -Hellman Key Exchange. CSCI 5857: Encoding and Encryption. Outline. Key exchange without public/private keys. Public and private components of . Diffie. -Hellman. Secure information exchange in . Diffie. Sixth Edition. by William Stallings . Chapter 10. Other Public-Key Cryptosystems. “Amongst the tribes of Central Australia every man, woman, and child has a secret or sacred name which is bestowed by the older men upon him or her soon after birth, and which is known to none but the fully initiated members of the group. This secret name is never mentioned except upon the most solemn occasions; to utter it in the hearing of men of another group would be a most serious breach of tribal custom. When mentioned at all, the name is spoken only in a whisper, and not until the most elaborate precautions have been taken that it shall be heard by no one but members of the group. The native thinks that a stranger knowing his secret name would have special power to work him ill by means of magic.”. Security and Cryptographic Algorithms. Dr Sandra I. Woolley. Contents. A summary of security threats and requirements. Cryptography vs steganography. Keys and the Caesar cipher. Cryptanalysis. The Vigenère cipher. -Hellman Key Exchange. CSCI 5857: Encoding and Encryption. Outline. Key exchange without public/private keys. Public and private components of . Diffie. -Hellman. Secure information exchange in . Diffie. Andy Malone. CEO & Founder. The Cybercrime Security Forum. Explaining the Unexplained: Part One. Andrew.malone@quality-training.co.uk. SIA400. Note: . Although this is a level 400 session. It is designed to be a training session providing history, development and practical uses of Cryptography and as such if you already consider yourself an expert in cryptography then this session will be 300 Level.. in . Mathematical Informatics. Lecture 3. : . Other Applications of Elliptic Curve. 23. h. October 2012. Vorapong Suppakitpaisarn. http://www-imai.is.s.u-tokyo.ac.jp/~mr_t_dtone/. vorapong@mist.i.u-tokyo.ac.jp. Announcements. Essay due. Next homework – crypto (on paper). This week: more on encryption and authentication, then on to access control. Last time: symmetric key cryptography. Based on shared knowledge of a private key. CSE3002 – History of Computing. Group A: Daniel . Bownoth. , Michael Feldman, Dalton Miner, Ashley Sanders. Encryption. The process of securing information by transforming it into code.. Encrypted data must be deciphered, or . Diffie. -Hellman. The . ElGamal. . Public-key System. Online Cryptography Course Dan Boneh. Recap: public key encryption: . (Gen, E, D). E. D. pk. m. c. c. m. Crypto Concepts Symmetric encryption, Public key encryption, and TLS Cryptography Is: A tremendous tool The basis for many security mechanisms Is not: The solution to all security problems Reliable unless implemented and used properly Prof. David . Singer . Dept. of . Mathematics. Case Western Reserve University. Fall 2012. Modern Cryptography. New Directions in Cryptography,. by Whitfield . Diffie. and Martin Hellman, 1976.. Whitfield . -Hellman key exchange. k. 1. = (h. 2. ). x. = . g. xy. k. 2. = (h. 1. ). y. = . g. xy. h. 1. h. 2. G, q, . g. x .  . ℤ. q. h. 1. = . g. x. y .  . ℤ. q. h. 2. = . g. y. Security?. Eavesdropper sees G, q, g, . Lecture 10. Foundations of Cryptography. Today: . Constructions of Public-Key Encryption. 1: . Trapdoor Permutations (RSA). 2:. Quadratic . Residuosity. /Goldwasser-Micali. 3:. Diffie-Hellman/El Gamal.