Abstract
An online questionnaire is a simple and efficient method of acquiring diverse data for surveys. However, a proportion of respondents have strong concerns about whether questionnaires in this form will leak their privacy, which causes their unwillingness to fill out the questionnaires. Blockchain is well known for decentralization, traceability, and transparency and is now widely used in all kinds of platforms. Fully homomorphic encryption is another popular technique that ensures the safety of privacy, it helps to compute and use encrypted data without decrypting it. To solve privacy-preservation problems and enhance online data sharing, this paper dedicates to demonstrating how the merits of Blockchain and Fully Homomorphic Encryption (FHE) can be utilized to realize a secure, reliable, and decentralized online-questionnaire platform that guarantees the authenticity of data and privacy security for clients. This paper also proves that the combination of blockchain and FHE can successfully meet the expectation of an ideal online questionnaire platform.
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