Cryptanalysis of a fast cryptographic checksum algorithm

A critical analysis of the modified cryptographic checksum algorithm published by F. Cohen and H.J. Huang points out two major weaknesses in the scheme. The first weakness is a reduced dependency on the beginning of the plaintext. Secondly, the first bits of the key can be derived with an adaptive chosen text attack. With the aid of these bits, the plaintext can be manipulated with a negligible chance of detection.