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Which has a key length of 128 bits?

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Which has a key length of 128 bits?

(a) IDEA

(b) Triple-DES

(c) IDEA & Triple-DES

(d) None of the mentioned

I have been asked this question in examination.

Asked question is from Public Key Cryptosystems topic in division Encryption and Decryption of Digital Communications

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Best answer
The correct answer is (a) IDEA

For explanation I would say: Triple-DES uses 168 bit key size and IDEA and CAST uses 128 bits key length.

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