RC5

In cryptography, RC5 is a symmetric-key block cipher notable for its simplicity. Designed by Ronald Rivest in 1994, RC stands for "Rivest Cipher", or alternatively, "Ron's Code" (compare RC2 and RC4). The Advanced Encryption Standard (AES) candidate RC6 was based on RC5.

This article is about the block cipher. For the infrared remote control protocol, see RC-5.
RC5
One round (two half-rounds) of the RC5 block cipher
General
DesignersRon Rivest
First published1994
SuccessorsRC6, Akelarre
Cipher detail
Key sizes0 to 2040 bits (128 suggested)
Block sizes32, 64 or 128 bits (64 suggested)
StructureFeistel-like network
Rounds1-255 (12 suggested originally)
Best public cryptanalysis
12-round RC5 (with 64-bit blocks) is susceptible to a differential attack using 244 chosen plaintexts.
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