LUCIFER, A CRYPTOGRAPHIC ALGORITHM
A. Sorkin · Cryptologia · 1984
Lucifer, a direct predecessor of the DES algorithm, is a block-cipher having a 128 bit block size and 128 bit key length. Its general design principles and properties are described and discussed. A simple FORTRAN program is presented which implements the algorithm, providing a modern, secure cryptographic algorithm that can be used in personal computers. Lucifer is of special interest because it is in the same class of product ciphers as DES but is much simpler. Study of Lucifer may reveal cryptanalytic methods that can be applied to DES.