PPT-Stream ciphers The One Time Pad

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Online Cryptography Course Dan Boneh Symmetric Ciphers definition Def a cipher defined over is a pair of efficient algs E D

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Stream ciphers The One Time Pad: Transcript

Online Cryptography Course Dan Boneh Symmetric Ciphers definition Def a cipher defined over is a pair of efficient algs E D. 21 Fig 21 Main areas within cryptography This chapter gives an introduction to stream ciphers The pros and cons of stream ciphers Random and pseudorandom number generators A truly unbreakable cipher the OneTime Pad OTP Linear feedback shift register Matvey . Arye. , Princeton/Cloudflare. Albert . Strasheim. , . Cloudflare. Awesome CDN service for websites big & small. Millions of request a second peak. 24 data centers across the globe. Data Analysis. 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 . 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. † . 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/. /B. 609. :. . Introduction to. Cryptography. Fall 2015 . . Lecture 7. . Last Thursday’s lecture:. Quiz. Computationally secret . encryption. Today’s lecture:. Pseudorandom generators (PRGs). The One Time Pad. Online Cryptography Course Dan Boneh. Symmetric Ciphers: definition. Def. : a . cipher. defined over . . is a pair of “efficient” . algs. Stream ciphers are semantically secure. Online Cryptography Course Dan Boneh. Goal: secure PRG ⇒ semantically secure stream cipher. Stream ciphers are semantically secure. Thm. : . If . G. is a PRG, then the fixed-length stream cipher . (Gen, . Enc. , Dec) . described below has . indistinguishable encryptions in the presence of an eavesdropper. .. 0. Plaintexts. and . Unity Connection . 11.0. EDCS-1464707. Abbreviations. CUCA. - Cisco unity Connection Administration. REST. - Representational State Transfer. CSR . -. Certificate Signing Request. CA . - Certificate Authority. Substitution. Classical Ciphers. Transposition. Data Encryption Standard 1977. Modern Cryptography. “New Directions in Cryptography” 1976. Symmetric . key block ciphers. Public key ciphers. Stream ciphers. TRACDS. Middle East Technical University. October . 31, . 2012. Margaret . H . Dunham, . Michael . Hahsler, Yu . Su, . Sudheer. . Chelluboina. , . and Hadil Shaiba. Computer . Science and . Engineering . Faculty of Engineering Stream Cipher Course name: Data Encryption. Computer Engineering Dep. Lecturer: Fatimah Al-.

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