低速信息防护传输系统中使用的同步技术无法直接应用于高速信息防护传输系统,在高速信息防护传输系统若要正确提取密文,通信双方必须同步,从而使接收端能够准确地界定数据传输过程中有效数据的起始位置和终止位置。针对光量子噪声加密的高速信息防护传输系统,提出一种有效的密钥同步方案。设计了同步帧结构及同步过程,并周期性测量信道传输时延,迭代估算传输时延差以修正解密密钥到达时刻,完成高速信息传输下解密密钥与密文的同步。实验分析了影响密钥同步的重要参数,验证了该方案的可行性,并在实验所得数据的基础上分析了同步方案的成功率和误码率等关键性能指标。

The synchronization technology used in low-speed information protection transmission systems cannot be directly applied to high-speed information protection transmission systems. To correctly extract the ciphertext in high-speed information protection transmission systems, both communication parties must be synchronized so that the receiving end can accurately define the data transmission process, as well as the start and end positions of valid data. For a high-speed information protection transmission system encrypted using optical quantum noise, an effective key synchronization scheme is proposed herein. The synchronization frame structure and synchronization process are designed, the channel transmission delay is periodically measured, and the difference is iteratively estimated to correct the arrival time of the decryption key to complete the synchronization of the decryption key and the ciphertext under high-speed information transmission. This study analyzes the important parameters that affect the key synchronization, verifies the feasibility of the scheme, and analyzes the key performance indicators such as the success rate and bit error rate of the synchronization scheme based on the experimentally-obtained data.