Bob Decrypts Alice's Digital Signature Which Key He Used

A Top-Down Approach 6 th Edition Solutions to Review Questions and Problems. Then he uses SESSION_KEY to decrypt PART2 and gets MESSAGE concatenated with DIGITAL SIGNATURE.

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Only Bob can decrypt PART1 because he is the only one who knows the corresponding private key PRIV_KEY_BOB.

. If the message digest that Bob computes exactly matches the message digest received from Alice Bob is assured that the message came from the possessor of the. Bob uses Alices public key PUB_KEY_ALICE to decrypt DIGITAL_SIGNATURE. In cryptography a cipher block chaining message authentication code CBC-MAC is a technique for constructing a message authentication code from a block cipherThe message is encrypted with some block cipher algorithm in CBC mode to create a chain of blocks such that each block depends on the proper encryption of the previous block.

This interdependence ensures that a. Upon receiving the message and signature Bob decrypts the signature using Alices public key to recover the message digest and hashes the message using the same hash algorithm that Alice used. Bob decrypts PART1 and gets the SESSION_KEY.

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