1. What is a cipher? What are four fundamental goals of cryptography? 2. What is the difference between symmetric and as

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1. What is a cipher? What are four fundamental goals ofcryptography?
2. What is the difference between symmetric and asymmetriccryptography?
3. List some weaknesses of symmetric key cryptography.
4. List some major strengths of asymmetric key cryptography.
5. What are three main methods used to exchange secret keyssecurely?
6. What are five basic requirements for a cryptographic hashfunction?
7. What are two distinct goals of digital signatureinfrastructures?
8. Why might a certificate authority need to revoke a digitalcertificate?