With the development of computing technology and cryptography, high-speed digital physical noisegenerator is urgently required in cryptography at present.
由于数字物理噪声源可以产生随机性较好的随机数作为密钥，已被广泛应用于安全信息系统。
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In addition a digital signal generator was incorporated via a DDS chip AD9850 from Analog Devices inc, featuring accurate frequency preset, quick phase transformation and low phase noise.