Take the 2-minute tour ×
Information Security Stack Exchange is a question and answer site for Information security professionals. It's 100% free, no registration required.

If I wrote RC5-32/12/16, it would mean 32-bit words (which is 64-bit data blocks). What is "words".

I know the 12 is rounds and 16 is key size (16 bytes, so 128 bit).

share|improve this question

1 Answer 1

up vote 8 down vote accepted

The word size can be 16, 32, or 64 bits, and it determines the block size. "The algorithm assumes that the input block is given in two w-bit registers A and B..." This allows for optimization based on the target architecture.

Reference: The RC5 Encryption Algorithm (PDF)

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.