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What is cipher-block chaining?

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in Operating System by (102k points)
What is cipher-block chaining?

(a) Data is logically ‘ANDed’ with previous block

(b) Data is logically ‘ORed’ with previous block

(c) Data is logically ‘XORed’ with previous block

(d) None of the mentioned

I have been asked this question in final exam.

I would like to ask this question from Security in portion Security of Operating System

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The correct choice is (c) Data is logically ‘XORed’ with previous block

Explanation: None.

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