[Huang89] Y. J. Huang and F. Cohen, Some Weak Points of One Fast Cryptographic Checksum Algorithm and its Improvement, IFIP-TC11 Computers and Security, V8#1, February, 1989. IFIP TC-11, Computers and Security, V8#1, February, 1989. {This paper shows several weaknesses in one cryptographic checksum used as a viral defense, and shows how it can be improved.]