(d) Based on the following scenario, assume Ali and Aminah are trying to communicate over an...

Transcribed Image Text:

(d) Based on the following scenario, assume Ali and Aminah are trying to communicate over an insecure network using public-key encryption. Ali and Aminah have published their public keys on their website. (You can assume they already know each other's correct public key). (i) Ali receives a message: Hey Ali, it's Aminah. You owe me RM200. Please send ASAP. The message is encrypted with Ali's public key. Can Ali trust it? [3 marks] (ii) Ali receives a message: Hey Aminah, that last message you sent me was sketchy. I don't think I owe you RM200. You owe me. The message is digitally signed using Ali's private key. Can she trust it was from Ali? How does she verify this message? [3 marks] (iii) Ali receives a message: Hey Ali, I know things have been rough these last two messages. But I trust you now. Here is my password: xyzABC123. The message is encrypted with Ali's public key. Ali decrypted the messages and tested the password, and it was in fact Aminah's! Can an eavesdropper figure out the password? [3 marks] (d) Based on the following scenario, assume Ali and Aminah are trying to communicate over an insecure network using public-key encryption. Ali and Aminah have published their public keys on their website. (You can assume they already know each other's correct public key). (i) Ali receives a message: Hey Ali, it's Aminah. You owe me RM200. Please send ASAP. The message is encrypted with Ali's public key. Can Ali trust it? [3 marks] (ii) Ali receives a message: Hey Aminah, that last message you sent me was sketchy. I don't think I owe you RM200. You owe me. The message is digitally signed using Ali's private key. Can she trust it was from Ali? How does she verify this message? [3 marks] (iii) Ali receives a message: Hey Ali, I know things have been rough these last two messages. But I trust you now. Here is my password: xyzABC123. The message is encrypted with Ali's public key. Ali decrypted the messages and tested the password, and it was in fact Aminah's! Can an eavesdropper figure out the password? [3 marks]

Answer rating: 100% (QA)

i Ali receives a message Hey Ali its Aminah You owe me RM200 Please send ASAP The message is encrypted with Alis public key Can Ali trust it In this s... View the full answer