Figure depicts the transmission of an electronic message incorporating public key cryptography, encryption, and digital signatures. Answer the following questions related to that figure:
1. Can anyone read the message? Why?
2. Can Sally be sure the message is from Harry? Why?

3. Is the digital signature message (containing the hash total calculated by Harry) secret? Why? 4. Could anyone other than Harry send the digital signature message?
5. How does Sally know that the message has not been corrupted in transit?
6. Which question, or questions, above are related to authenticity?
7. Which question, or questions, above are related to integrity?
8. Which question, or questions, above are related toconfidentiality?

Transcribed Image Text:

Harry encrypts the Harry message with sally's Sally public kay(C) 1.2,3 HT DS DS Same? Harry prepares message hash total, enclosee it in the DS message, and encrypts the message with his public key(B) Key A Harrys public key B Harry's private key C Sally's public key D Sally's private key M -message HT hash total (cakculated by sally from the message) DS digital signature (containing hash total calculated by Harry)