True random number generators (TRNGs) are considered as an innovative basis to obtain unpredictable and irreproducible digital bit-streams in secure systems and communications. Because of its ultra-low power and extremely-small size features, the quantum-dot cellular automata (QCA) is most promising nanoelectronic technology for implementing digital systems with security capabilities. This paper presents a novel QCA implementation of TRNG, which is comprised of proposed cross-coupled circuit and cross-oriented structure, in order to generate truly random numbers. This implementation extracts the randomness from the oscillatory trajectory of QCA cross-coupled loop that is composed of XNOR gates only to guarantee the quality of randomness. Furthermore, it exploits the oscillatory metastability resulting from zero-energy QCA cells of cross-oriented structure that is connected across cross-coupled outputs to increase the quality of randomness. Its behavior is verified through QCA simulations and its architecture is passed statistical tests of random numbers. Consequently, the proposed QCA-based TRNG can be considered as a promising candidate for future security applications in Nano communications.

真正的随机数发生器（TRNG）被认为是在安全系统和通信中获得不可预测且不可再现的数字比特流的创新基础。由于具有超低功耗和超小尺寸的特点，量子点自动机（QCA）是用于实现具有安全功能的数字系统的最有前途的纳米电子技术。本文提出了一种新颖的TRNG的QCA实现，它由提出的交叉耦合电路和交叉定向结构组成，以生成真正的随机数。该实现方案从由XNOR门组成的QCA交叉耦合环路的振荡轨迹中提取随机性，只是为了保证随机性的质量。此外，它利用了交叉结构的零能量QCA单元所产生的振荡亚稳定性，该单元跨交叉耦合的输出而连接，从而提高了随机性。它的行为通过QCA仿真得到了验证，其体系结构通过了随机数的统计测试。因此，提出的基于QCA的TRNG可以被认为是纳米通信未来安全应用的有希望的候选者。