Effective Privacy Preservation and Fast Signature Verification in Bitcoin Transaction

Zhenhua Liu ； Yuanyuan Li ； Dong Yuan ； Yaohui Liu

《International Journal of Network Security》 21卷5期 (2019/09) Pp. 741-750

https://doi.org/10.6633/IJNS.201909_21(5).05

摘要

As a decentralized cryptocurrency, bitcoin has attracted considerable attentions. In the original bitcoin system, a transaction script is described as a plaintext and thus reveals the privacy. Furthermore, it takes at least one hour to confirm one transaction, which causes high latency. In view of these shortcomings, a new protocol is proposed to preserve the transaction privacy and speed the verification of transaction. Firstly, a modified homomorphic Paillier cryptosystem is used to preserve transaction privacy for our protocol. Moreover, we combine Zhu et al.'s interactive incontestable signature with Boneh et al.'s aggregate technique to present a new aggregate signature scheme, which can process a batch signature and greatly reduce the storage space. Then our aggregate signature scheme is applied to achieve fast verification for our protocol. Finally, our aggregate signature scheme is proved to be unforgeable in the random oracles, and performance analysis shows that our protocol has the property of privacy preserving and high efficiency.

關鍵字

Aggregate Signature ； Fast Verification ； Paillier Cryptosystem ； Privacy Preserving