Industrial Technology Research Institute

Chih-Yin Lin

Chen-Hwa Song

Yau-Deh Tzeng

A logging system and method based on a one-way hash function are described. The system includes a user system, a trusted third party, and a verifier. The method includes the following steps. The user system records a log file and initializes a message authentication code key and an image code. When the verifier requests the user system for a logging unit corresponding to an operation history, the user system uses a one-way hash function to calculate a check value and returns the check value and an image code sequence. The verifier then verifies the integrity of the check value and the image code sequence through the trusted third party. The trusted third party checks if the image code sequence obtained by the hash calculation equals to the check value through the one-way hash function, so as to verify that the log file of the user system has not been modified.

Logging system and method based on one-way hash function

The invention is directed to a method for applying a certificate suitable for a portable telephone belonging to a user, wherein the portable telephone comprises a telephone number. The method comprises steps of generating a user key pair in the portable telephone, wherein the key pair comprises a user public key information and then transmitting an applying packet from the portable telephone to a certificate authority through a switching center by using a short message service, wherein the applying packet comprises at least the user public key information. The user is verified according to the telephone number received by the certificate authority from the switching center. A certificate packet is generated by the certificate authority, wherein the certificate packet comprises at least a serial number and a certificate authority signature. The certificate packet is transmitted to the portable telephone according to the telephone number by using the short message service.

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Taoyuan, Taiwan

Chih-Yin Lin