Smart contract based concealed communication method under blockchain

Abstract

The invention discloses a smart contract based concealed communication method under a blockchain. The concealed communication method comprises the following steps: preliminary encryption and coding are carried out on concealed information to be transmitted; and a keyword key is generated; a sender transmits the key and the hash value of the key to a receiver; the receiver judges whether the keyword key is tampered or not, if the keyword key is tampered, communication is terminated, and if not, the next step is executed; the receiver creates a contract according to the key so as to correspond to the real information sequence; the receiver creates an address white list called by the contract; the sender publishes the contract, and after the miner finishes mining, the contract is formally deployed in the block chain; the sender calls the contract; the receiver restores the encrypted information according to the contract calling record; and the receiver performs decoding and decryption inverse processing on the restored encrypted information to restore the original information. The invention provided by the invention is simple, high in security and tamper resistance, low in complexityof used contracts, and good in application prospect.

Description

technical field [0001] The invention belongs to the field of information hiding, and in particular relates to a concealed communication method under a block chain realized by using an intelligent contract. Background technique [0002] Traditional covert communication mainly relies on centralized channels, which are concentrated and single, and are easy to be targeted. Attackers can monitor channels and intercept data packets to detect the existence of covert communication. Due to the reliance on centralized nodes or third-party servers to ensure channel security, once the central node has a trust problem or is compromised, the traditional covert communication information will be leaked or even tampered with. In addition, attackers can obtain the identity information of both parties through traffic analysis. The blockchain technology that has emerged in recent years can effectively solve the problems of centralized channels by virtue of its decentralization characteristics....

AI Technical Summary

Problems solved by technology

The above method has three deficiencies. One is that the concealment of information transmission using the least significant bit is not strong, and regular analysis for the least significant bit makes the communication have the risk of being detected; the second is that the time interval sequence is used as the information embedding carrier The communication effect is susceptible to network fluctuations; the third is that when transmitting a large amount of information, both methods require a large number of information transmission times, which is not suitable for the Bitcoin network based on workload proof and the average block confirmation time is as long as ten minutes. Applicable, resource-intensive and time-intensive

Images