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量子安全直接通信是继量子密钥分配之后提出的又一重要量子密码协议,它要求通信双方在预先不需要建立共享密钥的情况下就可以实现消息的保密传输.给出了一个新的量子安全直接通信方案,该方案利用量子Calderbank-Shor-Steane(CSS)纠错码和未知量子态不可克隆等性质,方案的安全性建立在求解一般的线性码的译码问题是一个NP完全问题、Goppa码有快速的译码算法和量子图灵机不能有效求解NP完全问题的基础上.在协议中,发送方Alice把要发送的秘密消息转化为一一对应的错误向量,把错误向量加到其接收到的、Bob编码过的量子态上,并发给接收方Bob.Bob利用其私钥,通过测量、解码可以得到错误向量,并可以用相应的算法恢复出秘密消息.控制量子信道的攻击者Eve不能恢复出秘密消息,因其不知道Bob的密钥.与已有的量子安全直接通信方案相比,该方案不需要交换任何额外的经典信息和建立量子纠缠信道.
Quantum secure direct communication is another important quantum cryptographic protocol proposed after quantum key distribution, which requires both parties of communication to realize the secure transmission of the message without the need of establishing the shared key in advance.A new quantum This scheme uses the Calderbank-Shor-Steane (CSS) error correction code and the unclonable quantum states of unknown quantum. The scheme’s security is based on the NP-complete problem of solving the decoding problem of the general linear code. Goppa has a fast decoding algorithm and the quantum Turing machine can not effectively solve the NP complete problem. In the protocol, the sender Alice transforms the secret message to be sent into one-to-one corresponding error vector and adds the error vector to it Bob received the encoded quantum state, and sent to the receiver Bob.Bob use its private key, through the measurement, decoding can be error vector, and can use the appropriate algorithm to recover the secret message.Adversities that control the quantum channel Eve can not recover the secret message because he does not know Bob’s key. Compared with the existing quantum secure direct communication solution, the solution does not need to exchange any Classical Quantum Entanglement information and establish a channel outside.