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Article type: Research Article
Authors: Grontas, Panagiotisa; * | Pagourtzis, Arisa | Zacharakis, Alexandrosa | Zhang, Bingshengb
Affiliations: [a] School of Electrical and Computer Engineering, National Technical University of Athens, Greece. E-mails: pgrontas@corelab.ntua.gr, pagour@cs.ntua.gr, azach@corelab.ntua.gr | [b] College of Computer Science and Technology, Zhejiang University, China. E-mail: bingsheng@zju.edu.cn
Correspondence: [*] Corresponding author. E-mail: pgrontas@corelab.ntua.gr.
Abstract: This work formalizes Publicly Auditable Conditional Blind Signatures (PACBS), a new cryptographic primitive that allows the verifiable issuance of blind signatures, the validity of which is contingent upon a predicate and decided by a designated verifier. In particular, when a user requests the signing of a message, blinded to protect her privacy, the signer embeds data in the signature that makes it valid if and only if a condition holds. A verifier, identified by a private key, can check the signature and learn the value of the predicate. Auditability mechanisms in the form of non-interactive zero-knowledge proofs are provided, so that a cheating signer cannot issue arbitrary signatures and a cheating verifier cannot ignore the embedded condition. The security properties of this new primitive are defined using cryptographic games. A proof-of-concept construction, based on the Okamoto–Schnorr blind signatures infused with a plaintext equivalence test is presented and its security is analyzed.
Keywords: Blind signatures, designated verifier signatures, plaintext equivalence, coercion-resistant electronic voting
DOI: 10.3233/JCS-181270
Journal: Journal of Computer Security, vol. 29, no. 2, pp. 229-271, 2021
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