PPT-Cryptography Lecture 25 Public-key encryption

pk sk pk c Enc pk m m Dec sk c c pk pk Publickey encryption A publickey encryption scheme is composed of three PPT algorithms Gen keygeneration algorithm. 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. Sixth Edition. by William Stallings . Chapter 9. Public Key Cryptography and RSA. “Every . Egyptian received two names, which were known respectively as the true name and the good name, or the great name and the little name; and while the good or little name was made public, the true or great name appears to have been carefully concealed. Aalto . University. , . autumn. . 2012. Outline. Symmetric encryption. Public-key encryption. Cryptographic authentication. 2. Most. . important. !. Brief. . introduction. to . encryption. and . CS 465. Last Updated. : . Aug 25, 2015. Outline. Provide a brief historical background of cryptography. Introduce definitions and high-level description of four cryptographic primitives we will learn about this semester. 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 . What is cryptography?. Ceasar. Cipher. Public key cryptography. What is cryptography?. Cryptography.  or . cryptology.  (from . Greek.  . κρυπτός.  . kryptós. , "hidden, secret"; and . Overview. Encryption technologies. Combining encryption technologies for practice. Using encryption technologies for identification – digital signatures. Public key infrastructure. 2. Introduction. Vadim . Lyubashevsky. Cryptography. Allows for secure communication in the presence of malicious parties. 2. Cryptography. Allows for secure communication in the presence of malicious parties. 3. Cryptography. UNIT 4 LESSON 7 – 2 DAY LESSON. VOCABULARY ALERT. :. asymmetric encryption.  - used in public key encryption, it is scheme in which the key to encrypt data is different from the key to decrypt. .. MAT 302: Algebraic Cryptography LECTURE 1 Jan 2, 2012 MAT 302: Cryptography from Euclid to Zero-Knowledge Proofs LECTURE 1 Jan 2, 2012 Administrivia (see course info sheet) Instructor Vinod Vaikuntanathan Crypto is amazing. Can do things that initially seem impossible. Crypto is important. It impacts each of us every day. Crypto is fun!. Deep theory. Attackers’ mindset. Necessary administrative stuff. It looks like we will have 1-2 lectures devoted to “special topics”. Will not be on final exam. Schedule on webpage has some candidate topics. Feel free to email me suggestions for topics. Dlog. -based PKE. P. ublic-key encryption ( Asymmetric Encryption). Asymmetric encryption is a form of cryptosystem in which . encryption and . decryption are performed using the different keys—one a public . key and . -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, .