生物特徵是利用每個生物個體中，能夠代表該個體，且利用其它個體不相同的特性，來達到辨識的功能，如：指紋、虹膜、聲紋…等等；而電腦系統中，來分辨使用者的不同，就只有靠帳號以及密碼的配對與否來決定，而道高一尺，魔高一丈，隨者著時間的過去，有心人士也發展出了各式各樣來猜測，破解帳號密碼的方法，來取得本來應該存放於系統之中，安全無虞的資料，或個人隱私。
在此，我們為了強化傳統使用的密碼系統，我們將之並用使用者的敲鍵特徵，在許多的研究中，證明了使用者的敲鍵是一個可重覆發生的生物特徵，再加上並用使用者敲鍵特徵於密碼系統並不會有大幅變更，可以用最小的成本來得到最大的效益，另外，除了使用者的辨識外，我們尚利用敲鍵特徵的可重覆性來記錄使用者的私人密鑰，只要使用者輸入他的帳號密碼，系統便可還原出不存在於系統之中的密鑰，以供其它用途，如：使用公開金鑰的加解密、私人簽章…等等。

The biometrics is to make use of in each living creature individual, can represent that individual, and make use of the not same characteristic in other individual. Reach the function that recognize. Such as fingerprint, iris, sound… etc. And in the computer systems, distinguish the user’s different, only have depend on whether ID and passwords form couples or not to decide. With time passed, intruders also develop lots of way or guessing passwords, to get data or personal privacy originally store in system.

Enhancing the password systems. It also with the user's keystroke dynamics at many researches Proved the user's keystroke is a repeatable occurrence. And adding user's keystroke dynamics in password system can use the minimum cost to get the biggest benefit. Besides, in addition to user recognizing, we make use of keystroke dynamics and its property of repeatable to record private key of the user. Only the user input his ID and password, system can restore the key that is not stored in the systems. Then provided for other uses, such as using the public key systems, signature ... etc.

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