MOBT: A kleptographically-secure hierarchical-deterministic wallet for multiple offline Bitcoin transactions

【Author】 Wang, Haiyu; Li, Xuelian; Gao, Juntao; Li, Wei

【Source】FUTURE GENERATION COMPUTER SYSTEMS-THE INTERNATIONAL JOURNAL OF ESCIENCE

【影响因子】7.307

【Abstract】Small and immediate offline transactions are a trend in current bitcoin transactions. However, the previous articles mainly focused on the security of single offline transaction. In multiple offline bitcoin transactions, users deposit a small amount of bitcoins in advance into the wallet several times. For each deposit, the offline wallet has to generate a new pair of public and private keys and store it, which impose a heavy storage burden on the offline wallets and lower the efficiency of the transaction. Besides, a malicious attacker is able to embed a Secretly Embedded Trapdoor with Universal Protection (SETUP) into the offline wallet by infecting the user's storage device, hence he can launch the kleptographic attack to get user's private keys. In this paper, we propose a secure and efficient Bitcoin payments in multiple offline transactions. Our scheme relies on the master public key property of the hierarchical deterministic (HD) wallet to generate the key pairs of our offline wallet (MOBT). At the same time, an interactive signature protocol is used to protect MOBT from the kleptographic attack during the offline payments. We demonstrate the security of MOBT wallet and analyze the wallet's capability to resist the kleptographic attack. The results show that the MOBT wallet is secure even if m - 1 child private keys are leaked out. Furthermore, users can store their bitcoins in the wallet once. It only requires a half of the original storage volume under multiple offline bitcoin transaction. Finally, we compare the current mainstream wallets features on the market. We also discuss a novel approach for double-spending attack under offline probability payments. (C) 2019 Elsevier B.V. All rights reserved.

【Keywords】Multiple offline transactions; Bitcoin offline wallet; The kleptographic attack; Double-spending attack; Coin forgery attack

【发表时间】2019 DEC

【收录时间】2022-01-02

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