What is the difference between cipher block chaining mode and electronic code book mode?

ECB (Electronic Codebook) is essentially the first generation of the AES. It is the most basic form of block cipher encryption.

CBC (Cipher Blocker Chaining) is an advanced form of block cipher encryption. With CBC mode encryption, each ciphertext block is dependent on all plaintext blocks processed up to that point.

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the correct answer is: a.)it is never appropriate to use acronyms and emoticons in business communication.