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These three ciphers can operate of ______ of plaintext and cipher text.(a) 128 bit blocks(b) 64 bit blocks(c) 256 bit blocks(d) 156 bit blocksThe question was asked in an interview.I'd like to ask this question from Pretty Good Privacy topic in chapter Encryption and Decryption of Digital Communications

Answer»

Correct CHOICE is (b) 64 bit BLOCKS

The EXPLANATION is: The three ciphers – Triple-DES, IDEA and CAST can operate on 64 bit blocks of plain TEXT and cipher text.



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