University of Technology-IraqEngineering and Technology Journal1681-6900281220100628Proposed 256 bits RC5 Encryption Algorithm Using Type-3 Feistel Network2337235227698ENYossra H. AliJournal Article20100601Proposed 256 bits RC5 is an improvement to RC5, designed to meet
the requirements of increased security and better performance. Proposed
256 bits RC5 algorithm makes use of data dependent rotations. One new
feature of proposed 256 bits RC5 algorithm is modified its design to use
four 64-bit registers rather than two 32-bit registers. The proposal 256 bits
RC5 algorithm using Type-3 Feistel network which is iterated simple
function 20 times. An Avalanche Effect of RC5 is about 31.372 if we
change the same amount of information in key for 256 bits RC5 then the
Avalanche Effect is about 142.909. The proposed algorithm is resistant to
matching and a dictionary attack which is increased the security of the
previous RC5 algorithm by using block size of 256 bits instead of 64 bits.https://etj.uotechnology.edu.iq/article_27698_89b59480cc8aeee5dd16bb4853f763ba.pdf