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The science and mathematics of encoding and decoding information.
See also Cryptarithm, Knapsack Problem, Public-Key Cryptography
References
Davies, D. W.  The Security of Data in Networks.  Los Angeles, CA: IEEE Computer Soc., 1981.
 
Diffie, W. and Hellman, M.  ``New Directions in Cryptography.''  IEEE Trans. Info. Th. 22, 644-654, 1976.
 
Honsberger, R.  ``Four Clever Schemes in Cryptography.''  Ch. 10 in Mathematical Gems III.
  Washington, DC: Math. Assoc. Amer., pp. 151-173, 1985.
 
Simmons, G. J.  ``Cryptology, The Mathematics of Secure Communications.''  Math. Intel. 1, 233-246, 1979.