1.

Which block cipher has key length of 128 bits?(a) IDEA(b) CAST(c) IDEA & CAST(d) None of the mentionedThe question was asked during an internship interview.My question comes from Pretty Good Privacy in section Encryption and Decryption of Digital Communications

Answer»

Correct choice is (c) IDEA & CAST

For explanation: The BLOCK CIPHERS IDEA and CAST has key length of 128 bits where as Triple-DES has key SIZE of 168 bits.



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