Block Ciphers Intermediate
The RC5 and RC6 Algorithms
RC5 and RC6 are built from just three operations: addition, XOR, and rotations whose amounts come from the data itself. Learn how Ron Rivest's flexible RC5 led to RC6, an AES finalist.
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#AES Finalist
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Block Ciphers Advanced
The Serpent Algorithm
Serpent finished second in the AES competition, and it was built to be the safest finalist. Learn how 32 rounds of tiny S-boxes and a bitslice design traded speed for one of the largest security margins of any block cipher.