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How is rc6 encryption similar to rc5 encryption?


Asked by Elliott Russell on Dec 03, 2021 FAQ



RC6 is very similar to RC5 in structure, using data-dependent rotations, modular addition, and XOR operations; in fact, RC6 could be viewed as interweaving two parallel RC5 encryption processes, although RC6 does use an extra multiplication operation not present in RC5 in order to make the rotation dependent on every bit in a word,...
Besides,
New features of RC6 include the use of four working registers instead of two, and the inclusion of integer multiplication as an additional primitive operation. The use of multiplication greatly increases the diffusion achieved per round, allowing for greater security, fewer rounds, and increased throughput.
Also Know, RC6 is a block cipher based on RC5 and designed by Rivest, Sidney, and Yin for RSA Security. Like RC5, RC6 is a parameterized algorithm where the block size, the key size, and the number of rounds are variable; again, the upper limit on the key size is 2040 bits.
And,
RC5 was developed by Ron Rivest. It is a block encryption algorithm based on the symmetric key. The main feature of this is, it is quite fast as it uses only primitive computer operations. It allows a variable number of rounds and variable bit size key to add flexibility. Another advantage of using RC5 is that it requires less memory for execution.
In this manner,
Since the AES submission is targeted at w = 32 and r = 20, we shall use RC6 as shorthand to refer to such versions. When any other value of w or r is intended in the text, the parameter values will be specified as RC6-w/r.