【摘要】 纯文本信息隐藏容易遭受删除、更改等主动攻击,使嵌入的秘密信息遭到破坏。区块链因具有不可篡改、不可伪造、匿名性、节点信息同步等特点,成为构建隐蔽信道的天然平台,并确保秘密信息不被破坏。文中提出了一种面向纯文本信息隐藏的区块链隐蔽通信模型。首先,根据偏序关系确定嵌入秘密信息的位置,发送方使用空格法将秘密信息嵌入到纯文本内容中;然后,构建区块链网络隐蔽通信的场景,发送方将载有纯文本内容的交易发布到区块链网络上;最后,在交易打包并形成链块后,任意节点均可作为接收方获取文件,但只有受信方可以通过嵌入算法的逆过程提取出秘密信息。实验对比及分析表明,该模型具有较好的抗检测性、鲁棒性、安全性和较高的隐藏容量。更为重要的是,以区块链作为信道的方法可使受信方身份得以隐藏,通信过程的隐蔽性得到了双重保障。更多还原

【Abstract】 Plain text information hiding is vulnerable to active attacks such as deletion and change,which makes the embedded secret information damaged.Blockchain is characterized by non-tampering,non-forgery,anonymity and node information synchronization,making it a natural platform for building hidden channels and ensuring that secret information is not destroyed.This paper proposes the blockchain covert communication model for plain text information hiding.Firstly,the location of the embedded secret information is determined according to the partial order relation.The sender uses the space method to embed the secret information into the plain text content.Then,a scenario of hidden communication in the blockchain network is constructed,and the sender publishes the transaction containing the plain text content to the blockchain network.Finally,after the transaction is packaged and a chain block is formed,any node can obtain the file as the receiver,but only the trusted party can extract the secret information through the inverse process of the embedded algorithm.Experimental comparison and analysis show that the model has better anti-detection,robustness,security and higher hiding capacity.More importantly,the blockchain as a channel enables the identity of the trusted party to be hidden,and the concealment of the communication process is doubly guaranteed.更多还原