Security Analysis of Threema

A group of Swiss researchers have published an impressive security analysis of Threema.

We provide an extensive cryptographic analysis of Threema, a Swiss-based encrypted messaging application with more than 10 million users and 7000 corporate customers. We present seven different attacks against the protocol in three different threat models. As one example, we present a cross-protocol attack which breaks authentication in Threema and which exploits the lack of proper key separation between different sub-protocols. As another, we demonstrate a compression-based side-channel attack that recovers users’ long-term private keys through observation of the size of Threema encrypted back-ups. We discuss remediations for our attacks and draw three wider lessons for developers of secure protocols…

January 19, 2023
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Skyscraper of cards

Having put it off for far too long, I’m belatedly trying to catch up with some standards work in the area of Root of Trust, which for me meant starting with the basics, studying simple introductory articles about RoT.As far as I can tell so far, RoT i…

July 18, 2022
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