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Which one of the following algorithm is not used in asymmetric-key cryptography?

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Which one of the following algorithm is not used in asymmetric-key cryptography?

(a) rsa algorithm

(b) diffie-hellman algorithm

(c) electronic code book algorithm

(d) dsa algorithm

I got this question in final exam.

My question is from Cryptography topic in portion Networking of Computer Network

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Correct answer is (c) electronic code book algorithm

Easiest explanation: Electronic code book algorithm is a block cipher method in which each block of text in an encrypted message corresponds to a block of data. It is not feasible for block sizes smaller than 40 bits.

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