Event Details
Privacy-Preserving Protocols: Advancing Security and Flexibility with Policy-Based Sanitizable Signatures and Fair Exchange Mechanisms
Presenter: Ismail Afia
Supervisor:
Date: Tue, April 22, 2025
Time: 10:00:00 - 10:45:00
Place: Zoom - see below.
ABSTRACT
Abstract:
This research presents advancements in privacy-preserving protocols, focusing on two research areas: policy-based sanitizable signature schemes and fair exchange mechanisms. Sanitizable signature schemes allow designated parties to modify or sanitize signed messages while preserving the message’s authenticity. We present the Unlinkable Policy-Based Sanitizable Signature (UP3S) scheme, which addresses a significant deficiency in existing policy-based sanitizable signature schemes, the lack of unlinkability. A crucial security property, particularly in privacy-sensitive applications, unlinkability guarantees that distinct sanitized versions of a given message cannot be linked to the original message or to each other, even across multiple sanitization operations. Building upon UP3S, we investigate extending its capabilities to support fine-grained control over message modifications. This involves enabling multiple modification policies for a single message and facilitating the delegation of sanitization rights. To this end, we propose the Traceable Policy-Based Signature (TPBS) scheme, which forms the basis for the Extended Policy-Based Sanitizable Signature (EP3S). EP3S offers a flexible and secure framework for policy-based sanitizable signatures, incorporating enhanced control over message modifications and sanitization-rights delegation. In the area of fair exchange mechanisms, our contributions focus on privacy-preserving exchanges of both digital and physical assets. We introduce V2VFx, a privacy-preserving framework for the fair exchange of physical assets, specifically in vehicle-to-vehicle energy trading. Together, these contributions advance the state of privacy-preserving protocols by addressing key limitations in existing schemes and extending their applicability.
Location: Remote via Zoom
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Meeting ID: 825 9995 4578
Password: 875141
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