Suppose A wants to send a message to B with a public key encryption. Let Apub an

Question

Suppose A wants to send a message to B with a public key encryption. Let Apub and Apriv be A's public key and private key, respectively; use similar abbreviations for B. Suppose C knows both public keys but neither private key. If A sends a message to B, what encryption should A use so that only B can decrypt the message? (This property is called secrecy.) Can A encrypt a message so that anyone receiving the message will be assured the message came only from A? (This property is called authenticity.) Can A achieve both secrecy and authenticity in one message? Why not? Justify answer.

Explanation / Answer

Not because, A can only achive secracy.A encrypt message using B's public then B decypt the message using its own private key and vice versa , C doesnot get this message because C only have public key not private keys of B.

authenticity can't be achive because authentication needed , B should know secrate key of A to confirm that message comming from A and B doesn't have it.

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