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The default key size of RC2 Feistel cipher is _______

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The default key size of RC2 Feistel cipher is _______

(a) 64GB

(b) 64 bits

(c) 64 bytes

(d) 64KB

I have been asked this question in exam.

This intriguing question originated from Cryptography in division Number Theory and Cryptography of Discrete Mathematics

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Best answer
The correct option is (c) 64 bytes

For explanation: RC2 is a 64-bit source-heavy Feistel cipher system with a default key size of 64 bits. It is a complex cipher which uses secret indices and performs bitwise rotations, logical operations(AND, NOT, and OR) and modular addition.

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