{Cryptographic mechanisms or cryptographic} arrangements for secret or secure communication the encryption apparatus using shift registers or memories for block-wise {or stream} coding, e.g. DES systems {or RC4; Hash functions; Pseudorandom sequence generators}
{Cryptographic mechanisms or cryptographic} arrangements for secret or secure communication the encryption apparatus using shift registers or memories for block-wise {or stream} coding, e.g. DES systems {or RC4; Hash functions; Pseudorandom sequence generators}