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Addition to 'The Existence of Good Cryptosystems for Key Rates Greater Than the Message Redundancy'

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1 Author(s)

Three points related to a previous correspondence are reported here. Two new classes of cryptosystems are shown to share the property of additive-like instantaneous block (ALIB) ciphers; namely, good cryptosystems exist for key rates greater than the message redundancy. Furthermore, the optimality of the independence of the key and the message in a cryptosystem is established.

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Information Theory, IEEE Transactions on  (Volume:26 ,  Issue: 1 )