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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. |
