PPT-Symmetric Key Ciphers

Author : ellena-manuel | Published Date : 2017-10-09

Block Ciphers Slides Original Source M Stamp Information Security Principles and Practice John Wiley C Paar and J Pelzl Understanding Cryptography A Textbook for

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Symmetric Key Ciphers: Transcript

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 . 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. † . Configuration. WebSec. 101. mike.andrews@foundstone.com. mike@mikeandrews.com. Intro Music by . DoKashiteru. via . CCMixter. Nothing in isolation. Network. Operating System. Libraries. Web server. 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/. The data encryption standard (DES). Online Cryptography Course Dan Boneh. Block ciphers: crypto work horse. E, D. CT Block. n. bits. PT Block. n. bits. Key. k Bits. Stream ciphers are semantically secure. Online Cryptography Course Dan Boneh. Goal: secure PRG ⇒ semantically secure stream cipher. Stream ciphers are semantically secure. Distribution. CSCI 5857: Encoding and Encryption. Outline. Key management issues. Trusted third party approach. Key distribution center protocol. Needham-Schroeder protocol. 3. Key Management Problems. October 2015. What’s New in PKI and SSL?. The State of PKI and SSL/TLS. Many organizations don’t run their own Public Key Infrastructure. Utilize a managed PKI, or MPKI. Almost all organizations have a website and need public certificates. Online Cryptography Course Dan Boneh. Block ciphers: crypto work horse. E, D. CT Block. n. bits. PT Block. n. bits. Key. k . bits. Canonical examples:. 3DES: n= 64 bits, k = 168 bits. CS 161: Computer Security. Prof. . Raluca. Ada . Popa. Sept 13, 2016. Announcements. Project due Sept 20. Special guests. Alice . Bob. The attacker (Eve - “eavesdropper”, Malice). Sometimes Chris too. Online Cryptography Course Dan Boneh. Symmetric Ciphers: definition. Def. : a . cipher. defined over . . is a pair of “efficient” . algs. (. E. , . D. Symmetric . Key Distribution Using Asymmetric Encryption . Distribution . of Public Keys. Key Management and Distribution. Symmetric Key Distribution Using Symmetric Encryption. For symmetric encryption to work, the two parties to an exchange must . Rajat Mittal. (IIT Kanpur) . Boolean functions. or . Central object of study in Computer Science. AND, OR, Majority, Parity. With real range, real vector space of dimension . Parities for all . , .

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