[Solved]Q21 Suppose Bob Sender Wants Send Message M 654321 Alice Receiver However Sending Message Q37131742

Q2.1
Suppose Bob (the sender) wants to send a message m=654321 to Alice(the receiver). However, before sending the message he would liketo sign the message. When Alice receives the signed message, shewould like to verify that the message is indeed from Bob. Tofacilitate signing and verification Bob generates public andprivate keys using the RSA encryption algorithm and sends thepublic key to Alice. Bob uses parameter p = 9973 and q = 7541, andchooses a suitable public key parameter e=7321. How would Bob signmessage m=654321? How would Alice verify the signed message fromBob?
[Hints: Refer to the lecture-6 and tutorial-6. You do not need togenerate a hash of the message m.]

Q2. (Digital Signatures) [2+2+2+1-7 Marks] Suppose Bob and Alice, two business partners, use their smart phones to communicate with each other regarding their business decisions. Hence, their messages are very sensitive and require to be authenticated. Otherwise, an attacker, say one of their business rivals, may perform phone number porting fraud attack. In this attack, the attacker may use another SIM card to port Alice or Bob’s phone number for pretending as Alice or Bob, respectively. Therefore, BoB and Alice uses digital signature scheme in their smart phone to sign messages for ensuring authenticity. The working procedure of the dgital signature is illustrated in FigureQ2. Message Bob’s Siqned Message Signing with private-key Bob (Sender) Verification Verified Message Verification with Bob’s public-key Alice (Receiver) Answer Q2.1, Q2.2 and Q2.3 using the scenario mentioned above. Show transcribed image text Q2. (Digital Signatures) [2+2+2+1-7 Marks] Suppose Bob and Alice, two business partners, use their smart phones to communicate with each other regarding their business decisions. Hence, their messages are very sensitive and require to be authenticated. Otherwise, an attacker, say one of their business rivals, may perform phone number porting fraud attack. In this attack, the attacker may use another SIM card to port Alice or Bob’s phone number for pretending as Alice or Bob, respectively. Therefore, BoB and Alice uses digital signature scheme in their smart phone to sign messages for ensuring authenticity. The working procedure of the dgital signature is illustrated in FigureQ2. Message Bob’s Siqned Message Signing with private-key Bob (Sender) Verification Verified Message Verification with Bob’s public-key Alice (Receiver) Answer Q2.1, Q2.2 and Q2.3 using the scenario mentioned above.

Expert Answer

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Answer to Q2.1 Suppose Bob (the sender) wants to send a message m=654321 to Alice (the receiver). However, before sending the mess… . . .