Security in Key Agreement: Two-Party Certificateless Schemes

摘要: The main goal of cryptography is to enable secure communication over a public channel; often secret shared among the communicating parties used achieve this. process by which these agree on such called key agreement. In this thesis, we focus two-party agreement protocols in public-key setting and study various methods establish validate keys. We pay particular attention certificateless schemes attempt formalize relevant notion security. To that end, give possible extension existing extended Canetti-Krawzcyk security model applicable setting. observe none have seen literature are model; it an open question whether exist. analyze several published protocols, demonstrating existence compromise impersonation attacks even man-in-the-middle attack one case, contrary claims authors. also briefly describe weaknesses exhibited context our suggested model.