CRYPTOGRAPHIC DATA PROCESSING METHOD, CRYPTOGRAPHIC DATA PROCESSING SYSTEM, CRYPTOGRAPHIC DATA PROCESSING DEVICE, AND CRYPTOGRAPHIC DATA PROCESSING PROGRAM

摘要

PROBLEM TO BE SOLVED: To reduce the risk of leakage of data to be protected.SOLUTION: A cryptographic data processing method includes: generating a code 15a from data 14a by using an error correction encoding method 13b; generating a code 15b from the code 15a and a random number 16a by using an error correction encoding method 13a; generating mask data 17a by masking data 14b to be registered, with the code 15b, to register the mask data 17a on a storage unit 11; generating a code 15c from a random number 16b by using the error correction encoding method 13a; generating mask data 17b by masking data 14c to be collated, with the code 15c; generating synthesized data 17c by synthesizing the mask data 17b with the mask data 17a registered on the storage unit 11; and decoding the synthesized data 17c in accordance with the error correction encoding method 13a and the error correction encoding method 13b.SELECTED DRAWING: Figure 1