Which of the following is NOT a mode used by block ciphers?
A. ECB
B. CBC
C. CFB
D. CTR
E. IV
E
Explanation: Initialization vector (IV) is NOT a mode used by block ciphers. The block cipher modes use IVs to ensure that patterns are not produced during encryption. But IVs are not modes.
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Fill in the blank(s) with the appropriate word(s).
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