Modify a classical cryptosystem to provide nonrepudiation

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The section on public key cryptosystems discussed nonrepudiation of origin in the context of public key cryptosystems. Consider a secret key system (in which a shared key is used). Bob has a message that he claims came from Alice, and to prove it he shows both the cleartext message and the ciphertext message. The ciphertext corresponds to the plaintext enciphered under the secret key that Alice and Bob share. Explain why this does not satisfy the requirements of nonrepudiation of origin. How might you modify a classical cryptosystem to provide nonrepudiation?

Reference no: EM131310343

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