Reference no: EM132440149
1.1. What are the essential ingredients of a symmetric cipher?
2. What are the two basic functions used in encryption algorithms?
3 How many keys are required for two people to communicate via a symmetric cipher?
4 What is the difference between a block cipher and a stream cipher?
5 What are the two general approaches to attacking a cipher?
6 Why do some block cipher modes of operation only use encryption while others use both encryption and decryption?
7 What is triple encryption?
8 Why is the middle portion of 3DES a decryption rather than an encryption?
2.1 List three approaches to message authentication.
2. What is a message authentication code?
3. What properties must a hash function have to be useful for message authentication?
4. In the context of a hash function, what is a compression function?
5. What are the principal ingredients of a public-key cryptosystem?
6. List and briefly define three uses of a public-key cryptosystem.
7. What is the difference between a private key and a secret key?
8. What is a digital signature?
3.1 List ways in which secret keys can be distributed to two communicating parties.
2. What is the difference between a session key and a master key?
3. What is a key distribution center?
4. What entities constitute a full-service Kerberos environment?
5. In the context of Kerberos, what is a realm?
6. What are the principal differences between version 4 and version 5 of Kerberos?
7. What is a nonce?
8. What are two different uses of public-key cryptography related to key distribution?
9. What are the essential ingredients of a public-key directory?
10. What is a public-key certificate?
11. What are the requirements for the use of a public-key certificate scheme?
12. What is the purpose of the X.509 standard?
13. What is a chain of certificates?
14. How is an X.509 certificate revoked?