Covert Communication Model Based on Dynamic Time Binary Tree

Abstract

A covert communication model based on a dynamic time-based binary tree involves a sender selecting a specific moment and generating a binary tree for that moment using the generation rules of the dynamic time-based binary tree. The sender then obtains the root hash from the root node of the tree and extracts a random factor from it. This random factor is then used to assign a different path code to each tree node. Based on the path code of each node, a corresponding path code and index node are generated for each character in the encoded information. The sender embeds the selected moment into an empty bit of the path code field, then concatenates the path code field and index node field, embeds them in a blockchain transaction, and sends them. The receiver extracts the selected moment embedded by the sender and restores the binary tree for the corresponding moment. This invention improves communication efficiency while ensuring security and avoids the security risks associated with the pre-negotiation process.

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