| 摘要 |
PROBLEM TO BE SOLVED: To provide a token-based encryption and decryption method that can reduce communication overhead between an application server and a token server in a token-based encryption and decryption process and that can continue encryption/decryption processing even if failure occurs in the token server.SOLUTION: Creating in advance, in an application server, a token image file that stores original sentence code messages made up of numeric value strings in a needed range and token code messages corresponding to the respective numeric value strings by associating them with each other enables processing at the application server side, and thereby enables reduction in communication overhead and continuation of processing at a time of token server failure. |
