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Schnorr Multi-Signatures for Secure Devices with Restricted Interfaces

    Author: Jakub-Janků

    Supervisor: Antonín Dufka

    Abstract: This thesis focuses on the provable security of modern Schnorr multisignatures and their applicability in constrained settings of secure hardware, smart cards and TPMs specifically. The primary result is a multi-signature scheme with multiplicative key sharing accelerated using the ECDH primitive commonly provided by smart cards. A proof-of-concept implementation comprising an optimized JavaCard applet and an Android reader application is provided to demonstrate the scheme’s practicality.