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αη协议是一种利用量子噪声隐藏信息的随机加密协议.通过求解高斯噪声信道中窃听者获取信息量的计算公式,推导了该协议实际安全判据.结果表明,协议是否安全主要取决于信源量子态的平均光子数和密文符号数.基于此,计算了在光束分离攻击下两者的安全取值区间以及协议的有效通信距离.
The αη protocol is a random encryption protocol that uses quantum noise to conceal the information.The practical security criterion of the protocol is deduced by solving the calculation formula of the amount of information obtained by the eavesdropper in the Gaussian noise channel.The results show that whether the protocol is secure depends mainly on the source The average number of photons and the number of ciphertexts in the quantum state.According to this, the safe range of the two under the beam separation attack and the effective communication distance of the protocol are calculated.