Question

How do you perform signature verification on an RSA signed message?

Answer 1

To perform signature verification on an RSA signed message, follow these steps: Obtain the public key, decrypt the signature, generate a hash of the message, and compare the hashes. If they match, the signature is valid.

Step-by-step explanation:

To perform signature verification on an RSA signed message, follow these steps:

1. Obtain the public key of the signer.
2. Obtain the signed message, which includes the message itself and the signature.
3. Decrypt the signature using the public key, resulting in a hash.
4. Generate a hash of the message using the same hash function that was used to create the original hash.
5. Compare the decrypted hash with the generated hash.
6. If the two hashes match, the signature is valid. Otherwise, it is invalid.

For example, if the original message was 'Hello, world!' and the signature was created using SHA-256, you would obtain the public key, decrypt the signature, generate a hash of 'Hello, world!' using SHA-256, and compare the two hashes. If they match, the signature is verified.