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In order to provide a low-cost and simple user attestation method, in our previous work, we proposed a method with strong authentication by using digital camera of cellular phone. But, this method used 2D color code, thus there are some process costs such as create and decode 2D color code. In this paper, we present an improved attestation system using a cellular phone and 2D color code. We compare the performance of the encryption methods and the efficiency of the proposed attestation method is confirmed by an experimental prototype system.