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Authors:
William Stallings
Chapter:
Electronic Mail Security
Exercise:
Problems
Question:9 | ISBN:9781292158587 | Edition: 7

Question

The first 16 bits of the message digest in a PGP signature are translated in the clear. This enables the recipient to determine if the correct public key was used to decrypt  the message digest by comparing this plaintext copy of the first two octets with the first two octets of the decrypted digest.

a. To what extent does this compromise the security of the hash algorithm?
b. To what extent does it in fact perform its intended function, namely, to help determine if the correct RSA key was used to decrypt the digest?

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