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Cryptography and Network Security: Cryptographic Hashes, Message Digests and Digital Certificates
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Cryptography and Network Security: Cryptographic Hashes, Message Digests and Digital Certificates
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25 Questions

1. PGP makes use of which cryptographic algorithm?
2. If the compression function is collision resistant, then so is the resultant iterated hash function.
3. Which of these systems use timestamps as an expiration date?
4. What is a one-way password file?
5. What is the value of opad in the HMAC structure?
6. When a hash function is used to provide message authentication, the hash function value is referred to as
7. Message authentication code is also known as
8. A larger hash code cannot be decomposed into independent subcodes.
9. It is desirable to revoke a certificate before it expires because
10. Which one of the following is not a public key distribution means?
11. What is the PGP stand for?
12. .
13. Data Authentication Algorithm (DAA) is based on
14. Which of the following is not an element/field of the X.509 certificates?
15. Which one of the following is not an application hash functions?
16. Which of the following is not a part of an Extension?
17. In CMAC, which scenario is a different key K2 is used instead of K1?
18. The subject unique identifier of the X.509 certificates was added in which version?
19. Suppose that A has obtained a certificate from certification authority X1 and B has obtained certificate authority from CA X2. A can use a chain of certificates to obtain B's public key. In notation of X.509, this chain is represented in the correct order as .
20. Certificates generated by X that are the certificates of other CAs are Reverse Certificates.
21. CRL stands for
22. Which systems use a timestamp?
i. Public-Key Certificates
ii. Public announcements
iii. Publicly available directories
iv. Public-Key authority
23. What is the full-form of CMAC?
24. Which of the following public key distribution systems is most secure?
25. Which system uses a trusted third party interface?

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