Sample SET Cryptography Steps 7-10
7)Bob uses the secret key to decrypt property description, Alice’s signature and her certificate
8)Bob decrypts Alice’s digital signature with her public key which he gets from her certificate. This recovers message digest (which is 160 bit) of property description
9)Bob uses same hash algorithm as Alice on her property description. He produces a new message digest of the decrypted property description
10)Bob compares his calculated with transmitted message digest
- If they are exactly the same, then the material was not altered in transit and indeed came from Alice!
- If they are not the same, notify authorities