High-Speed One-Bit Cipher Feedback Arrangement
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07
This article discloses a one-bit cipher feedback (CFB) arrangement which attains high-speed operation by using the multiplicity of cipher engines operating in parallel. Fig. 1 illustrates the CFB mode of operation for a transmitting and receiving station connected via a communication line. The operation is essentially a stream method of encryption in which the algorithm, e.g., the Data Encryption Standard (DES), is operated under control of the cipher key K to generate n pseudo-random bits, where 1 < n < 64, which are Exclusive-ORed with n bits of plaintext to form n bits of ciphertext.