Non-public key cryptographic system for e.g. SEED encryption system, has compensation unit generating and storing compensation data such that sum of Hamming distances for encoded data and compensation data is maintained constant

摘要

The system has an encryption unit (210) which updates and stores data encoded in accordance with an encryption algorithm, at each round, and outputs encoded data after number of rounds. A compensation unit (230) generates and stores compensation data in a manner that a sum of Hamming distance for the updated and stored encoded data and Hamming distance of the compensation data is maintained at a constant value. An independent claim is also included for a method for encrypting an input data in accordance with an encryption algorithm.