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COSC2536 Security In Computing

tag 0 Download 10 Pages / 2,452 Words tag 10-11-2020


1. Suppose Bob (the sender) wants to send a signed message m=3456 to Alice (the receiver). However, before sending the message he would like to sign the message. When Alice receives the signed message, she would like to verify that the message is indeed from Bob. To facilitate signing and verification Bob generates public and private keys using ElGamal encryption algorithm and sends the public key to Alice. Bob chooses p=8081, g=2849, x=59. How would Bob sign message m=3456? How would Alice verify the signed message from Bob?
2. Recall that we use both a public key system and a hash function when computing digital signatures. Suppose that the hash function used to compute and verify signatures is insecure, but the public key system is secure. Show that you can forge signatures.
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