Digest Ciphers, Stream Digests, and Winnowing Stream Ciphers

摘要: A digest algorithm such as MD5 can be used to create a stream cipher by setting $cipher[k i ~\dots~ k + - 1] = digest(key \parallel i) $, where the produces $k$ bits. We call {\it cipher}. build $k$-bit of an arbitrary string letting $digest(string) \bigoplus_{i} cipher[256 string_i 256 1]$. digest}. This paper describes characteristics necessary for high-quality ciphers and digests reports on experiments with in building ciphers. Finally, shows how chaffing winnowing added messages encrypted any appending each $n$ bits plaintext $m$ sequence number bit count.