The existing electronic voting system cannot meet the requirements of multiple applications, such as voting data privacy, fairness between voters, the flexibility of voter qualification control, the accuracy of voting results, and the delayed publication of voting results. In response to the above problems, this paper proposed a time-locked cryptographic e-voting scheme based on CP-ABE and blockchain. The proposed scheme comprehensively considered the multiple application requirements of electronic voting in practical scenarios. By combining the CP-ABE algorithm and Fabric technology, this proposed scheme could store the attribute encrypted voting links in the blockchain ledger and let only voting users who satisfied the attribute policy access the links, implementing a flexible mechanism for controlling voting eligibility and ensuring accurate voting results for different user groups' attributes. Furthermore, by using an improved time-locked encryption scheme to encrypt the voting data and send them to the blockchain, the proposed scheme guaranteed the confidentiality of voting data before announcing the expected results, preventing malicious nodes from causing collusive attacks and achieving the function of the delayed publication of voting results. The experiment verified the effectiveness of the proposed scheme in four aspects: user attribute restriction, voting link acquisition, voting data chaining, and voting result delay. The system test results show that this scheme can effectively control voting eligibility(that is, making voting users who comply with attribute policies can successfully obtain voting links and send their voting data to the blockchain for storage) and protect the confidentiality of voting data. Performance, security, and comparative analyses indicate the proposed scheme's feasibility.

[2023-07-05] Accepted Paper /doc/2023.02.0108/v1

[2023-11-05] Printed Article /doc/2023.02.0108/v2