ENCRYPTION SYSTEM USING DISCRETE CHAOS FUNCTION

摘要

The present relates to an encryption system comprising: an encryption round calculation unit for encrypting a plain text; and a substitution unit which is prepared at the encryption round calculation unit, is defined by a discrete chaos function using each of a plurality of key values as a parameter, and includes a plurality of S-boxes for performing a substitution calculation process for each of the words of the plain text which are divided by a plurality of numbers of key values. As the discrete chaos function becomes a reference of an S-box design and an encryption calculation operation is performed by the plurality of S-boxes, the present invention can be applied to a lightweight system having a small computational complexity.