ENCRYPTION PROCESSING DEVICE, ENCRYPTION PROCESSING METHOD, AND PROGRAMME

摘要

An encryption processing device with a high level of security is achieved by a supply control of round keys. Included are an encryption processing part configured to divide configuration bits of data to be data processed into a plurality of lines, and to input, and to repeatedly execute data conversion processing applying a round function to each line of data as a round calculation; and a key scheduling part configured to output round keys to a round calculation executing unit in the encryption processing part; wherein the key scheduling part is a replacement type key scheduling part configured to generate a plurality of round keys or round key configuration data by dividing a secret key stored beforehand into a plurality of parts; and wherein the plurality of round keys are output to a round calculation executing unit sequentially executing in the encryption processing part such that a constant sequence is not repeated. According to the present configuration, an encryption processing configuration with a high level of security is achieved that has a high level of resistance to repeated key attacks or other attacks, for example.