Three Types of Perfection in Shannon-Theoretic Cryptography
Three types of perfection in theoretical cryptography are examined. First, we briefly pay tribute to perfection as defined by Shannon; second, we define perfection (semi-perfection, rather) in the semiequivocation model put forward by this author; third, the notion of perfection as defined by Simmons in authentication theory is described. A short proof for a basic theorem due to Simmons is provided.
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