Security in Key Agreement: Two-Party Certificateless Schemes

dc.contributor.authorSwanson, Colleen Marie
dc.date.accessioned2008-12-22T20:28:16Z
dc.date.available2008-12-22T20:28:16Z
dc.date.issued2008-12-22T20:28:16Z
dc.date.submitted2008
dc.description.abstractThe main goal of cryptography is to enable secure communication over a public channel; often a secret shared among the communicating parties is used to achieve this. The process by which these parties agree on such a shared secret is called key agreement. In this thesis, we focus on two-party key agreement protocols in the public-key setting and study the various methods used to establish and validate public keys. We pay particular attention to certificateless key agreement schemes and attempt to formalize a relevant notion of security. To that end, we give a possible extension of the existing extended Canetti-Krawzcyk security model applicable to the certificateless setting. We observe that none of the certificateless protocols we have seen in the literature are secure in this model; it is an open question whether such schemes exist. We analyze several published certificateless key agreement protocols, demonstrating the existence of key compromise impersonation attacks and even a man-in-the-middle attack in one case, contrary to the claims of the authors. We also briefly describe weaknesses exhibited by these protocols in the context of our suggested security model.en
dc.identifier.urihttp://hdl.handle.net/10012/4156
dc.language.isoenen
dc.pendingfalseen
dc.publisherUniversity of Waterlooen
dc.subjectkey agreementen
dc.subjectcertificatelessen
dc.subjectkey establishmenten
dc.subjectkey compromise impersonationen
dc.subject.programCombinatorics and Optimizationen
dc.titleSecurity in Key Agreement: Two-Party Certificateless Schemesen
dc.typeMaster Thesisen
uws-etd.degreeMaster of Mathematicsen
uws-etd.degree.departmentCombinatorics and Optimizationen
uws.peerReviewStatusUnrevieweden
uws.scholarLevelGraduateen
uws.typeOfResourceTexten

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