Abstract
This paper argues for the introduction of better privacy mechanisms and greater anonymity in electronic transactions. The introduction contains an overview of related work—namely group signatures and e-cash systems. Next, we present an original solution based on Σ-protocols, which leads to a scheme providing anonymous client authentication without any loss of client responsibility. The preserved client responsibility is assured by the spread revelation feature. This allows the identification of malicious users by the cooperation of two entities—namely, a service provider with a newly introduced Public Authority entity. Finally, we analyze the presented scheme from the point of view of security and efficiency.
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