Building a Privacy-Preserving Blockchain-Based Bidding System: A Crypto Approach

Hsuan Hao Chen, Po Wen Chi*, Yun Hsin Chuang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Blockchain-based bidding systems are becoming increasingly popular nowadays. Due to the properties of blockchain, bidding records are unchangeable. With existing encryption techniques, these bidding records can only be shared by the bidder and the seller. Although this scenario sounds secure, it does not consider a coercion case. A powerful coercer may force the bidding system to open the records stored on the blockchain, and the system loses privacy. To solve this problem, in this paper, we introduce a new encryption scheme called deniable matchmaking encryption (DME). This new encryption scheme provides deniability not only for the message, but also for the identities. We use the chameleon hash function to make fake message and fake identities indistinguishable from the real message and the real identities. Therefore, the bidding system can use fake information to answer the coercer, and user privacy is kept by the blockchain-based bidding system.

Original languageEnglish
Pages (from-to)13367-13378
Number of pages12
JournalIEEE Access
Publication statusPublished - 2022


  • Deniable encryption
  • blockchain-based bidding system
  • chameleon hash function
  • matchmaking encryption

ASJC Scopus subject areas

  • General Computer Science
  • General Materials Science
  • General Engineering


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