Date Added: Mar 2012
Security is the most important concern now-a-days. Now the authors' education system improves, by the way intruders also increase. To protect users system from them, they need to improve security. When users leave the system alive without log off, at the time some intruders enter their system and may misuse their personal data. When they enter, they should make some keyboard or mouse operation to misuse their data. Based on their usage of mouse and keyboard, users may find the intruders easily. By using the typing rhythm in keyboard or the number of mouse clicks, they find the intruder using diagraph method.