| 摘要 |
PROBLEM TO BE SOLVED: To prevent information data stored in respective computers connected to a LAN such as a web server from being easily understood and illegally used. SOLUTION: A data ciphering program 12 integrated with an application program 11 is stored in a computer 1. The program 12 is started simultaneously with the start of the program 11, plain text data are temporarily stored in a memory 24 built in the computer 1, the plain text data are successively read out from the memory 24 and ciphered and the obtained ciphered sentence data are successively written in the memory 24. Then the ciphered sentence data are processed by the program 11. |
