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A kind of design method of encryption chip for mobile and portable applications is proposed in this paper. The encryption chip implements the AES (Advanced Encryption Standard) algorithm, which is the most advanced symmetric cipher algorithm at present. The external pins and internal circuit structure of the AES encryption chip are optimized according to the requirements of mobile and portable applications, so that it can be connected to an USB (Universal Serial Bus) interface chip directly, and its circuit scale and power dissipation can be reduced as far as possible under the constraint that its encryption and decryption speed matches the data transmission rate of the USB interface chip.
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