PPT-On Minimal Assumptions for Sender-Deniable Public Key Encryption

Dana Dachman Soled University of Maryland Deniable Public Key Encryption Canetti Dwork Naor Ostrovsky 97 Sender Receiver     s   For any in the message space can produce a . 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). Dan Fleck. CS 469: Security Engineering. These slides are modified with permission from Bill Young (. Univ. of Texas). Coming up: Public Key Encryption. 1. 1. Public Key . Encryption. In 1976, Whitfield . in the . B. ounded-. R. etrieval . M. odel. Joël. Alwen, . Yevgeniy. . Dodis. , . Moni. . Naor. , Gil . Segev. , . Shabsi. . Walfish. , Daniel . Wichs. . Speaker: Daniel . Wichs. The ROM, FDH, using the ROM. From previous lecture. Ciphers . Stream ciphers : many follow OTP + PRG strategy. Block ciphers : work on plaintext of limited size = block. output ciphertexts of same size. Chapter 9. 9-. 1. Learning Objectives. Identify and explain controls designed to protect the confidentiality of sensitive information.. Identify and explain controls designed to protect the privacy of customers’ personal information.. Music. At the beginning of the 20. th. century, composers . tried to break free from . tradition. But a . group of American composers went back to . basics: . rhythm + pitch = music. . Minimal music . from trapdoor permutations. Public key encryption:. definitions and security. Online Cryptography Course Dan Boneh. Public key encryption. E. D. Alice. Bob. pk. sk. 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. Something you should try to invent yourself. 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. pk. , . sk. pk. c. . . . Enc. pk. (m). m. = . Dec. sk. (c). c. pk. pk. Public-key encryption. A public-key encryption scheme is composed of three PPT algorithms:. Gen: . key-generation algorithm. Cryptography Lecture 3 So far… “Heuristic” constructions; construct, break, repeat, … Can we prove that some encryption scheme is secure? First need to define what we mean by “secure” in the first place… Slides by Prof. Jonathan Katz. . Lightly edited by me.. Review: private-key setting. Two (or more) parties who wish to securely communicate . share. a uniform, secret key k . in advance. Same key k used for sending or receiving. 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 . Techniques . Symmetric Cipher Model. Basic terminology:. Plaintext:. original message to be encrypted. Cipher text: . the encrypted message. Enciphering or encryption Algorithm: . The process of converting plaintext into cipher text..