| 摘要 |
PURPOSE:To prevent a hacker from illegally accessing a computer by simultaneously deciding the errors of a series of codes when >=2 series of codes are inputted or the all inputs are completed. CONSTITUTION:A host computer decides the errors whenever each one of a series of codes is inputted, and only when it is correct and when the all input of a series of the codes are executed in a different way from the method to require the next code input, since the simultaneous errors decision is executed, the number of combinations can be made extremely large. For example, when the first code consists of English letters having four digits and the second code to be next inputted consists of numbers having the four digits, (=26<4>X10<4>) combinations to be the product of the combinations of the first and second codes can be obtained, and the retrieve of the code of an unauthorized user by the hacker is made extremely difficult. |
