Research On Secure Transaction Model Based On Lightning Networ

Blockchain,with traceability,transparency and other functions for data,provids technical support for promoting the development of digital economy.But because blockchain consensus is time-consuming,lightning networks are another useful tool to promote the development of digital economy.Lightning network greatly improves the efficiency of blockchain through off-chain transactions and on-chain consensus,but it also has problems such as privacy disclosure of transaction users,insecure transaction amount and unbalanced network fund load.Aiming at the above problems,the thesis improves the two parts of lightning network(RSMC and HTLC)with the combination of multivariable public key cryptography(MPKC)and DH key exchange protocol,and applies the improved scheme to energy transaction scenarios.The specific work content is as follows.(1)Designated Verifier Multi-signature Scheme Based on MPKC.RSMC uses multi-signature to ensure the security of users’ offline transactions,but the traditional multi-signature has some problems,such as too much computational overhead and cannot resist quantum attacks.This will lead to the risk of privacy disclosure and capital theft in transactions based on lightning network.To solve the above problems,the thesis proposes a designated verifier multiple signature scheme(MPKC-DVMS)based on MPKC.Firstly,the formal definition and security model of MPKC-DVMS are given.Secondly,the realization steps of MPKC-DVMS are described in detail.Then the correctness of MPKC-DVMS is proved and the IND-CCA2 security scheme is proved to be in discriminable against adaptive selection message attack under random oracular machine model.Finally,MPKC-DVMS is compared with related multiple signature schemes,which proves that the proposed scheme has high running speed and does not need bilinear pairings.(2)A Security Transaction Model Based on HTLC.When there is no transaction channel for users in lightning network,HTLC is mainly used to realize cross-node transaction.However,due to the special structure of lightning network,there are many problems in HTCL stage.Therefore,the thesis proposes a HTLC-based secure transaction model,which includes three stages: path matching stage,payment stage and fund balance stage.In the stage of path matching,the traditional path matching uses onion route to search hop by hop,so there are problems of path is not optimal and transaction fee is too high.To solve this problem,the thesis comprehensively considers transaction fee,transaction path length and transaction node to carry out the optimal path matching.In the payment stage,HTLC needs to transmit a secret value R to pay before payment,so it is easy to receive man-in-the-middle attack in the transmission process,which leads to transaction failure.Therefore,DH key exchange protocol is used in the thesis to transmit R,and the transmission of R is changed into local calculation to ensure the security of the payment process.In the stage of capital balance,the thesis uses three parameters to balance user capital: transaction inspiration factor,transaction information concentration and transaction frequency.Experiments show that the proposed model is effective and more efficient than the traditional trading model.(3)A Mobile Energy Trading Scheme Based on Lightning Network.Aiming at the problems of low transaction efficiency and long waiting time in the mobile energy transaction scheme based on block chain.In the thesis,the above scheme is applied to the mobile energy trading scenario,and a mobile energy trading scheme based on lightning network is proposed to solve the problems of low transaction efficiency and high commission fee existing in the current mobile energy trading scheme.Experimental analysis shows that the proposed scheme is more efficient than the blockchain-based transaction scheme.