Method and system for maintaining secure data input and output

The method and system which raise the data security in the input and output on a client computer system are offered in order to prevent the trial of access of the data based on the code which is not approved, capture, and/or change. In a case of the operation, the security function extension driver who forbids the inspection/reception by which effective data is not approved using two or more obfuscation techniques and such obfuscation techniques is offered. When these security function extension drivers are used with various obfuscation techniques, these drivers offer the mechanism which carries out "scheduling" of the contents of the preservation domain used for preservation of data so that the receiver who is not approved cannot use effective data. When the receiver who is not approved tries access to "data", they will perceive and receive the obfuscated data. "Copy in", "substitution and recovery", and "regular-position substitution" reverse obfuscation / the re-obfuscating method are included in the obfuscation technology described. In one case of the operation, a security function extension display driver, security function extension mouse drivers, a security function extension keyboard driver, and a security function extension audio driver are offered. Furthermore, when required, this method and a system also offer various user interface techniques which display security on the watch watch mechanism which enables it to function a driver, and a display, so that they may complement strengthening of a security function.