Unformatted text preview: 142 LAB | Implement Digital Signatures LAB – ASSESSMENT WORKSHEET Implement Digital Signatures
Course Name and Number:
Mika Hendy Instructor Name:
Lab Due Date: Overview
In this lab, you performed several tasks that helped you understand the purpose and use of digital signatures
when sending secure messages. You used GnuPG (GPG), a free encryption utility, to digitally sign a message
for another user. You also retrieved that message, as a new user, and used GPG to verify the signature. Lab Assessment Questions & Answers
1. Describe three examples of situations where digital signatures might be useful. Contract, E-mail verification, Verify the integrity of a message 2. Does a digital signature provide confidentiality? Why or why not? No . Because document is traveling through the network unencrypted. Digital Signature onlyencrypts 38399_LMxx_Lab09.indd 142 9/10/12 1:23 PM Assessment Worksheet 143 private key Implement Digital Signatures 3. If Nancy wishes to digitally sign a message to Matthew, what key does she use to create the signature? 4. If Matthew receives a digitally signed message from Nancy, what key does he use to verify the signature? Nancy's public key 5. If Matthew wishes to digitally sign a message to Nancy, what key does he use to digitally sign the message?
Private Key 6. If Nancy receives a digitally signed message from Matthew, what key does she use to verify the signature? Matthew's Public Key 38399_LMxx_Lab09.indd 143 9/10/12 1:23 PM 38399_LMxx_Lab09.indd 144 9/10/12 1:23 PM ...
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- Fall '14
- Cryptography, Public-key cryptography, digital signatures, Implement Digital Signatures