In this letter, we propose a novel encrypted data transmission scheme using an intelligent reflecting surface (IRS) to generate secret keys in wireless communication networks. We show that perfectly secure one-time pad (OTP) communications can be established by using a simple random phase shifting of the IRS elements. To maximize the secure transmission rate, we design an optimal time slot allocation algorithm for the IRS secret key generation and the encrypted data transmission phases. Moreover, a theoretical expression of the key generation rate is derived based on Poisson point process (PPP) for the practical scenario when eavesdroppers’ channel state information (CSI) is unavailable. Simulation results show that employing our IRS-based scheme can significantly improve the encrypted data transmission performance for a wide-range of wireless channel gains and system parameters.

中文翻译：

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用于OTP加密数据传输的随机移动智能反射面


在这封信中，我们提出了一种新颖的加密数据传输方案，使用智能反射面（IRS）在无线通信网络中生成密钥。我们证明，可以通过使用 IRS 元件的简单随机相移来建立完全安全的一次性一密本 (OTP) 通信。为了最大化安全传输速率，我们为 IRS 密钥生成和加密数据传输阶段设计了最佳时隙分配算法。此外，针对窃听者信道状态信息（CSI）不可用的实际情况，基于泊松点过程（PPP）推导了密钥生成率的理论表达式。仿真结果表明，采用我们基于 IRS 的方案可以显着提高各种无线信道增益和系统参数的加密数据传输性能。