BLOCK ENCRYPTION DEVICE USING AUXILIARY CONVERSION

摘要

A data transformation method for executing a data processing process of inputting key data and performing at least one of encryption of data and decryption of data, and a key generating process of generating key data which is used by t he data processing process and supplying the key data to the data processing process , wherein the data processing process comprises a non-linear function process (F) for performing a non-linear transformation of data to be transformed, and wherei n the key generating process processes the key data to be supplied to the non-line ar function process (F), supplies a processed key data to calculate data to a part other than the non-linear function process (F) in the data processing process.