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).


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)

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