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Abstract

Secret key is required in secure communications, and random numbers are generally used as keys to encrypt the original information. So it is crucial for cryptography and secure communication to generate the physical random number, which is completely safer than pseudo random number. However, Existing physical random number generator systems are difficult to satisfy the requirements of high-speed communication due to their complexity, large size, and limited equipment bandwidth. The GaAs/Al _0.45Ga _0.55superlattices is based on a structure formed by the alternating growth of two semiconductor materials, and has a good low-dimensional structure for studying the nonlinear behavior of electrons. Recent studies have shown that the GaAs/Al _0.45Ga _0.55superlattices under the DC voltage could appear chaos current oscillation states in some certain voltage ranges. An all-solid-state real-time high-speed physical true random number generator based on superlattices is presented. The superlattices, excited by appropriate DC bias voltage, could generate a high-frequency chaotic oscillation signal as a source of physical entropy. A multi-bit analog-to-digital converter with 2 GHz sampling frequency is used for quantization to generate 12-bit binary random bits. Then, the field programmable gate array extracts the lowest 4 bits as valid bits and inverts bits to improve its randomness, and finally a true random number with a real-time rate of 8 Gbit/s is obtained. To obtained a superlattices signal with a higher degree of chaos, the Lyapunov exponent was used to assist in selecting a more suitable DC bias. The random number generated by the superlattices, owning excellent statistical characteristics, could pass the test of the random number industry standard (NIST SP 800-22), which is expected to be miniaturized and integrated on high-speed communication equipment.

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Corresponding author:Yang Dong-Dong,yd_xian@163.com

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Cited By

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统计测试	P值	通过百分比	结果
频率测试	0.514124	0.995	通过
块内频率测试	0.966244	0.990	通过
累加和测试	0.981609	0.993	通过
游程测试	0.782040	0.993	通过
块内长游程测试	0.657933	0.996	通过
二进制矩阵秩测试	0.379555	0.992	通过
离散傅里叶变换测试	0.196920	0.985	通过
非重叠模块匹配测试	0.938463	0.988	通过
重叠块比配测试	0.224821	0.987	通过
全局通用统计测试	0.513309	0.989	通过
近似熵测试	0.955835	0.998	通过
随机游动测试	0.637119	0.985	通过
随机游动变量测试	0.324180	0.986	通过
串行测试	0.637119	0.982	通过
线性复杂度测试	0.414525	0.995	通过

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Vol. 69, Issue 10 - 2020-05-20

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