a. What properties should a digital signature have?  b. In what order should the signature function and the confidentiality function be applied to a message, and why?  c. What happens if a K value used in creating a DSA signature is compromised? d. What is the difference between transport mode and tunnel mode? e. What is a replay attack?

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A: Answer is in next step. please give a like !!

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Cryptography

Cryptography is a term used in computer science to describe secure information and communication techniques that transform messages in difficult-to-decipher ways using mathematical concepts and a set of rule-based calculations known as algorithms.