Question: 17. What is the ECB (electronic code book) mode of operation? What is one flaw of ECB? 18. What is the CBC (cipher block chaining)

17. What is the ECB (electronic code book) mode of operation?

17. What is the ECB (electronic code book) mode of operation? What is one flaw of ECB? 18. What is the CBC (cipher block chaining) mode of operation? Why should the initialization vector (IV) be different for each plaintext message we want to encrypt with this mode? 19. There are three properties a cryptographic hash function might have. Briefly explain each a) pre-image resistance b) second pre-image resistance c) collision resistance

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