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Which are called the block ciphers?

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Which are called the block ciphers?

(a) IDEA

(b) CAST

(c) Triple-DES

(d) All of the mentioned

I had been asked this question in a job interview.

The above asked question is from Public Key Cryptosystems in section Encryption and Decryption of Digital Communications

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Right answer is (d) All of the mentioned

The best explanation: Some of the examples of block codes are triple-DES, CAST and IDEA.

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