[Solved]Q23 Suppose Bob Sender Wants Send Large Text Message M Alice Receiver Download Text Messa Q37131753

Q2.3
Suppose Bob (the sender) wants to send a large text message M toAlice (the receiver). You should download the text message file“Message.txt” from the CANVAS. The text message M is asfollows:
The invention of computers in the 20th century revolutionizedcryptology. IBM Corporation created a code, Data EncryptionStandard (DES) that has not been broken to this day. Thousands ofcomplex codes and ciphers have been programmed into computers sothat computers can algorithmically unscramble secret messages andencrypted files.
Before sending the message, Bob generates a hash h(M) of the textmessage M using MD5 hash algorithm, and converts h(M) into integermessage m. Then, he signs the m and sends it to Alice. When Alicereceives the signed message, she would like to verify that themessage is indeed from Bob. To facilitate signing and verificationBob generates public and private keys using RSA encryptionalgorithm and sends the public key to Alice. Bob uses the followingparameters:
p = 330620674058481288123238031776544995151
q = 273416090781657641961913344431645866621
Bob chooses a suitable public key parameter e=37. How would Bobsign message M? How would Alice verify the signed message fromBob?

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.

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Answer to Q2.3 Suppose Bob (the sender) wants to send a large text message M to Alice (the receiver). You should download the text… . . .