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Let k be the encipherment key for a Caeser cipher. The decipherment key differs ;it is 26-k.One of the characteristics of a public key system

Let k be the encipherment key for a Caeser cipher. The decipherment key differs ;it is 26-k.One of the characteristics of a public key system is that the encipherment and decipherment keys are different. When is the Caesar cipher a classical cryptosystem ,not public key system ?

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