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Stream Ciphers CS 519 Cryptography and Network Security Instructor: Ali Aydin Selcuk CS519, © A.Selcuk Stream Ciphers
Stream Ciphers ,[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers
Linear Feedback Shift Registers ,[object Object],[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers x n x n-1 x 1 . . . . . . . feedback fnc. output bits . . . . x n x n-1 x 1 . . . . . . . . . . . 
Stream Ciphers from LFSRs ,[object Object],[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers key stream . . . . LFSR 1 LFSR 2 LFSR k f . . .
Example LFSR-Based Ciphers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers
LFSR-Based Ciphers (cont’d) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers
GSM A5/1 ,[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers
Software-Oriented Stream Ciphers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers
RC4 (Rivest, 1987) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers
RC4 (cont’d) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers
SEAL Software-Optimized Encryption Algorithm ,[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers Algorithm Speed (MByte/s.) DES 22 AES 62 RC5-32/12 79 RC4 111 SEAL 920 MD5 205
RC4 & WEP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers
Attacks on WEP (Borisov, Goldberg, Wagner, 2000) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers
Attacks on WEP (cont’d) ,[object Object],[object Object],[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers
Attacks on WEP (cont’d) ,[object Object],[object Object],[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers
Attacks on WEP (cont’d) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers
Attacks on WEP (cont’d) ,[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers
Replacements for WEP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CS519, © A.Selcuk Stream Ciphers

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