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Computer Science AQA A level

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Question:

Describe the process of receiving a signatured message

Author: Will Parker



Answer:

Hint: 1. A digest of the message is created 2. This digest is encrypted with the sender’s private key 3. The encrypted digest is appended to the message This is the signature as it can only have come from the sender 1. Decrypted with senders private key 2. Digital signature is decrypted with senders public key 3. Message digest is regenerated by applying the hash function to the plaintext message 4. Message digest from digital signature is compared with regenerated message digest 5. If they are the same then the message is secure and untampered with


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