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alphabet, arithmetic, associativity, Caesar cipher, code, codomain, commutativity, composite, confusion, continuous, cryptosystem, cyclic group, DES, diffusion, discrete, distributivity, domain, field, function, galois field, group, matrix, message, polyalphabet, position, product, ramp scheme, relation, replacement, ring, substitution, sum, symbol, symmetric group, threshold scheme, toroidal matrix, transposition, universal algebra, vector space.
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