Abstract
The Federal Data Encryption Standard (DES) [1] is a block product cipher which converts 64-bit blocks of plaintext into 64-bit blocks of cipher text, or vice-versa, under the control of a 56-bit key. There has in the past been considerable controversy over the adequacy of DES key length [2,3,4]. Easily implemented modifications to the DES key schedule (KS) would allow the use of keys longer than 56 bits.
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References
Data Encryption Standard, FIPS PUB 46, U.S. Department of Commerce, National Bureau of Standards, (January, 1977).
W. Diffie and M.E. Hellman, “Exhaustive cryptanalysis of the NBS Data Encryption Standard,” Computer (10) pp.74–84 (June, 1977 ).
R. Morris, N.J.A. Sloane, and A. Wyner, “Assessment of the National Bureau of Standards proposed Federal Data Encryption Standard,” Crvptoloaia, (1) pp. 281–291 (July, 1977 ).
R. Sugarman, “On foiling computer crime,” IEEE Spectrum, (16), 7 (July, 1979 ).
D.W. Davies, “Some regular properties of the DES algorithm,” presented at CRYPTO ‘81, Santa Barbara, CA, (August, 1981 ).
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© 1983 Springer Science+Business Media New York
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Berson, T.A. (1983). Long Key Variants of DES. In: Chaum, D., Rivest, R.L., Sherman, A.T. (eds) Advances in Cryptology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-0602-4_30
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DOI: https://doi.org/10.1007/978-1-4757-0602-4_30
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