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Trusted computing is an important aspect of information security. The current algorithms of commercial cryptogram based on software in many fields often are not trusted. This paper proposes a new approach based on embedded system to implement the algorithms of commercial cryptogram, which can overcome the shortage of algorithm based on software, such as less security and low speed. And the prototype of the approach is also implemented in this paper, which contains FPGA and embedded system as a system on chip (SOC).