scholarly journals Efficient Extension of Standard Schnorr/RSA Signatures into Universal Designated-Verifier Signatures

2004 ◽  
pp. 86-100 ◽  
Author(s):  
Ron Steinfeld ◽  
Huaxiong Wang ◽  
Josef Pieprzyk
Keyword(s):  
Designated Verifier ◽  
Rsa Signatures

Publicly auditable conditional blind signatures

2021 ◽  
Vol 29 (2) ◽  
pp. 229-271
Author(s):  
Panagiotis Grontas ◽  
Aris Pagourtzis ◽  
Alexandros Zacharakis ◽  
Bingsheng Zhang
Keyword(s):  
Proof Of Concept ◽  
Equivalence Test ◽  
Zero Knowledge ◽  
Private Key ◽  
Blind Signatures ◽  
Cryptographic Primitive ◽  
Security Properties ◽  
Designated Verifier

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.

Code-based authentication with designated verifier

2016 ◽  
Vol 7 (1) ◽  
pp. 61 ◽  
Author(s):  
Yan Ren ◽  
Hongbin Wang ◽  
Jiali Du ◽  
Liqiong Ma
Keyword(s):  
Designated Verifier

scholarly journals Time-constrained strong multi-designated verifier signature suitable for Internet of things–based collaborative fog computing systems

2021 ◽  
Vol 17 (3) ◽  
pp. 155014772110017
Author(s):  
Han-Yu Lin
Keyword(s):  
Internet Of Things ◽  
Fog Computing ◽  
Discrete Logarithm ◽  
Signature Scheme ◽  
Computing Systems ◽  
Extended Technique ◽  
Diffie Hellman ◽  
Designated Verifier ◽  
Designated Verifier Signature ◽  
Cloud Servers

Fog computing is viewed as an extended technique of cloud computing. In Internet of things–based collaborative fog computing systems, a fog node aggregating lots of data from Internet of things devices has to transmit the information to distributed cloud servers that will collaboratively verify it based on some predefined auditing policy. However, compromised fog nodes controlled by an adversary might inject bogus data to cheat or confuse remote servers. It also causes the waste of communication and computation resources. To further control the lifetime of signing capability for fog nodes, an appropriate mechanism is crucial. In this article, the author proposes a time-constrained strong multi-designated verifier signature scheme to meet the above requirement. In particular, a conventional non-delegatable strong multi-designated verifier signature scheme with low computation is first given. Based on its constructions, we show how to transform it into a time-constrained variant. The unforgeability of the proposed schemes is formally proved based on the famous elliptic curve discrete logarithm assumption. The security requirement of strong signer ambiguity for our substantial constructions is also analyzed by utilizing the intractable assumption of decisional Diffie–Hellman. Moreover, some comparisons in terms of the signature size and computational costs for involved entities among related mechanisms are made.

scholarly journals Constructing Strong Identity-Based Designated Verifier Signatures with Self-Unverifiability

ETRI Journal ◽  
2012 ◽  
Vol 34 (2) ◽  
pp. 235-244 ◽  
Author(s):  
JuHee Ki ◽  
Jung Yeon Hwang ◽  
DaeHun Nyang ◽  
Beom-Hwan Chang ◽  
Dong Hoon Lee ◽  
...  
Keyword(s):  
Identity Based ◽  
Designated Verifier

Stronger Security and Constructions of Multi-designated Verifier Signatures

2020 ◽  
pp. 229-260
Author(s):  
Ivan Damgård ◽  
Helene Haagh ◽  
Rebekah Mercer ◽  
Anca Nitulescu ◽  
Claudio Orlandi ◽  
...  
Keyword(s):  
Designated Verifier
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