An Electronic Cash System Based on Group Blind Signatures

Informatica ◽  
2006 ◽  
Vol 17 (4) ◽  
pp. 551-564 ◽  
Author(s):  
Constantin Popescu
Keyword(s):  
Electronic Cash ◽  
Blind 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.

Electronic Cash and the Virtual Marketplace: Reflections on a Revolution Postponed

Organization ◽  
2007 ◽  
Vol 14 (6) ◽  
pp. 747-768 ◽  
Author(s):  
David Knights ◽  
Faith Noble ◽  
Theo Vurdubakis ◽  
Hugh Willmott
Keyword(s):  
Electronic Cash

Research on Electronic Cash Security Technology in Electronic Commerce

2013 ◽  
Vol 846-847 ◽  
pp. 1628-1631
Author(s):  
Song Jie Gong ◽  
Lin Di Jin
Keyword(s):  
Electronic Commerce ◽  
Rapid Development ◽  
Group Signature ◽  
Electronic Payment ◽  
Electronic Cash ◽  
Security Technology ◽  
Security Issues ◽  
Information Safety ◽  
Security Problem ◽  
Precautionary Measures

With the rapid development of electronic commerce, payment is becoming the focus problem of electronic commerce. Electronic cash has become the ideal method of electronic payment for it is able to realize fair, secure, effect electronic transacts. Along with electronic commerce development, electronic cash payment systems are also gradually developing. However, most electronic cashes are facing the security issues. Moreover, the amount of money each electronic cash card contains is fixed at issuance and is available only within a specified system. The key technology is digital signature technology, including blind signature, group signature, and ring signature. The paper researches the security problems of electronic cash in information safety and e-commerce, and discusses the electronic payment and the security problem, which is regarded as the foundation of electronic commerce. The main factors are given that causes security problems of electronic payment, and suggests corresponding precautionary measures.

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