IC Appropriate Countermeasure against Side Channel Analysis on Cryptogram Generating Process of Financial IC Cards

摘要

The present invention provides a countermeasure technique that guarantees sufficient safety and improves efficiency by analyzing a cryptographic system to which a countermeasure technique is applied first and applies only to a place where a countermeasure technique is structurally required. As a result, A subchannel analysis countermeasure method for providing security and reliability of a system by performing SEED algorithm, which is a symmetric key block cipher algorithm, more than once, (Master key) is used for the intermediate value function f (x, k) for the first SEED algorithm round key is applied, and the second and subsequent SEED algorithms are not applied to the round key corresponding technique .