无条件安全的(Unconditional Security)：如果假设攻击者在无限计算能力和计算时间的前 提下，也无法破译加密算法，就认为相应的密码体制是无条件安全的。
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由于此协议是在信息论通信模型下，所以协议是无条件安全的。
Since the presented protocol is based on information theoretic model, it is unconditionally secure.
该方案可以应用在分布式量子通信网络中，并证明是无条件安全的。
The scheme can be applied in the distributed quantum communication network. It is proved unconditional secure.
量子密码是与计算机密码处于同一时代的密码学分支，它以量子力学为基础，能实现无条件安全的保密通信。
Quantum cryptography and computer cryptography are two branches of cryptography at the same age. Quantum cryptography based on the quantum mechanics can achieve unconditionally secure communications.
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