CS 465 BYU

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Bobs\'s public key ring Joy Mike Alice Alice\'s public key Transmitted ciphertext Alice \'s private key Ted Plaintext input Encryption algorithm (e.g., RSA) Decryption algorithm (reverse of encryption algorithm) Plaintext output (a) Encryption Ali

User A Generate random XA < q; Calculate YA = aXA mod q User B YA YB Calculate K = (YB)XA mod q Generate random XB < q; Calculate YB = aXB mod q; Calculate K = (YA)XB mod q Figure 3.11 Diffie-Hellman Key Exchange

RC4 ISRL Special Topics in Security Lecture Series June 30, 2005 Tim van der Horst Rivest Cipher 4 Developed by Ronald Rivest in 1987 Originally known as \"Ron\'s Code\" 4 1 RC4* A variable size key cipher Encryption is 10 times faster than DES R

CS 465 Computer Security Kent Seamons Transport Layer Security Stud ent Learning G oal s U nd er stand T L S h and sh ak e U nd er stand c l i ent/ ser v er au th enti c ati on i n T L S RSA key exchange E xp l ai n o w ner

Advanced Encryption Standard ISRL Special Topics in Security Lecture Series July 19, 2005 Tim van der Horst How was AES created? AES competition Started in January 1997 by NIST 4-year cooperation between U.S. Government Private Industry Academ

CS 465 Computer Security Kent Seamons Terminology C r y p tog r ap h y - sec r et w r i ti ng Cryptographer s pec i al i s t i n c ryptography Cryptan al ys i s the s ol v i n g of c ryptographi c s ys tem s b y c

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