
 Symmetric Ciphers (Site not responding. Last check: 20071106) 
  Attacking Seven Rounds of Rijndael under 192bit and 256bit Keys, Stefan Lucks, Presented at the 3rd AES Candidate Conference (local copy). 
  Differential Cryptanalysis of the Full 16Round DES, E. Biham, and A. Shamir, CS 708, Proceedings of Crypto '92, LNCS 740, December 1991 (local copy). 
  An Improvement of Davies' Attack on DES, E. Biham, and A. Biryukov, CS 817, EUROCRYPT '94 Proceedings, LNCS 950, Springer Verlag, 1995, and Journal of Cryptology, Vol. 
 www.cs.ucla.edu /~jkong/research/security/symmetrickeycryptosystem.html (3780 words) 
