Hard Homogenous Spaces and Commutative Supersingular Isogeny based Diffie-Hellman

Tema ovog rada jest proces stvaranja 3D stvarnih ili imaginarnih objekata pomoću alata SolidWorks koji je u današnje vrijeme jedan od najpoznatijih alata kod modeliranja mehaničkih i projektnih objekata. Kako bi ga što više približio svakoj osobi, ukratko sam naveo najvažnije činjenice o samom alatu, prošao kroz njegovu povijest, objasnio za što ga možemo koristiti te najvećim dijelom prikazao kako se od jednog tehničkog nacrta dođe do gotovog objekta i modela

Compact, Efficient and UC-Secure Isogeny-Based Oblivious Transfer

Oblivious transfer (OT) is an essential cryptographic tool that can serve as a building block for almost all secure multiparty functionalities. The strongest security notion against malicious adversaries is universal composability (UC-secure). An important goal is to have post-quantum OT protocols. One area of interest for post-quantum cryptography is isogeny-based crypto. Isogeny-based cryptography has some similarities to Diffie-Hellman, but lacks some algebraic properties that are needed for discrete-log-based OT protocols. Hence it is not always possible to directly adapt existing protocols to the isogeny setting. We propose the first practical isogeny-based UC-secure oblivious transfer protocol in the presence of malicious adversaries. Our scheme uses the CSIDH framework and does not have an analogue in the Diffie-Hellman setting. The scheme consists of a constant number of isogeny computations. The underlying computational assumption is a problem that we call the computational reciprocal CSIDH problem, and that we prove polynomial-time equivalent to the computational CSIDH problem

Theory and Practice of Cryptography and Network Security Protocols and Technologies

In an age of explosive worldwide growth of electronic data storage and communications, effective protection of information has become a critical requirement. When used in coordination with other tools for ensuring information security, cryptography in all of its applications, including data confidentiality, data integrity, and user authentication, is a most powerful tool for protecting information. This book presents a collection of research work in the field of cryptography. It discusses some of the critical challenges that are being faced by the current computing world and also describes some mechanisms to defend against these challenges. It is a valuable source of knowledge for researchers, engineers, graduate and doctoral students working in the field of cryptography. It will also be useful for faculty members of graduate schools and universities