Sirvi Autor "Karu, Mihkel Jaas" järgi

Nüüd näidatakse 1 - 1 1

Design and Security Analysis of Blind Smart-ID/SplitKey Signature
(Tartu Ülikool, 2025) Karu, Mihkel Jaas; Snetkov, Nikita, juhendaja; Laud, Peeter, juhendaja; Krips, Toomas, juhendaja; Tartu Ülikool. Loodus- ja täppisteaduste valdkond; Tartu Ülikool. Arvutiteaduse instituut
A blind signature scheme is a cryptographic primitive that enables a user to obtain a signature on a message without revealing its content to the signer. This unique property ensures both the authenticity of the signature and the privacy of the message, making blind signatures particularly useful in applications requiring anonymity, such as electronic voting and digital cash systems. SplitKey [BKLO17] is a cryptographic technology designed to enable the creation of digital signatures using a private key distributed across two devices. However, it currently lacks support for blind signing. The goal of this thesis is to determine whether the original SplitKey design can be modified to create a blind signature scheme, and to explore how it could be done. To achieve this, the thesis presents a novel blind signature scheme, RSA-BSK, which extends the functionality of the SplitKey signature scheme to support blind signatures. We provide a detailed security analysis of RSA-BSK, including formal proofs of correctness, unforgeability, and blindness, thus establishing its suitability for privacy-preserving applications in a distributed key setting.