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The proliferations of the mobile intelligent terminal have brought them to the spotlight of the attackers for the sensitive information they carried. However, the current security schemes on the mobile intelligent terminal are fragile. This paper proposed a new transparent authentication and encryption measure to protect the confidentiality and integrity of the data on the mobile intelligent terminal. Our method is user-friendly as no interaction is needed during the process. Also, the result can be applied as evidence to identify who have used the phone.