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• W6819704 abstract "This thesis is divided into two distinct parts. The first part of the thesis explores various deniable signature schemes and their applications. Such schemes do not bind a unique public key to a message, but rather specify a set of entities that could have created the signature, so each entity involved in the signature can deny having generated it. The main deniable signature schemes we examine are ring signature schemes. Ring signatures can be used to construct designated verifier signature schemes, which are closely related to designated verifier proof systems. We provide previously lacking formal definitions and security models for designated verifier proofs and signatures and examine their relationship to undeniable signature schemes. Ring signature schemes also have applications in the context of fair exchange of signatures. We introduce the notion of concurrent signatures, which can be constructed using ring signatures, and which provide a “near solution” to the problem of fair exchange. Concurrent signatures are more efficient than traditional solutions for fair exchange at the cost of some of the security guaranteed by traditional solutions. The second part of the thesis is concerned with the security of two-party key agreement protocols. It has traditionally been difficult to prove that a key agreement protocol satisfies a formal definition of security. A modular approach to constructing provably secure key agreement protocols was proposed, but the approach generally results in less efficient protocols. We examine the relationships between various well-known models of security and introduce a modular approach to the construction of proofs of security for key agreement protocols in such security models. Our approach simplifies the proof process, enabling us to provide proofs of security for several efficient key agreement protocols in the literature that were previously unproven." @default.
• W6819704 created "2016-06-24" @default.
• W6819704 creator A5050196770 @default.
• W6819704 date "2006-01-01" @default.
• W6819704 modified "2023-09-27" @default.
• W6819704 title "Special Signature Schemes and Key Agreement Protocols" @default.
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