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New Model Improves Security Analysis of Signal Protocols

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🔗 New model enhances security analysis of Signal’s handshake protocols. Researchers Keitaro Hashimoto, Shuichi Katsumata, and Thom Wiggers have introduced Bundled Authenticated Key Exchange (BAKE), a comprehensive framework for analyzing the Signal protocol’s handshake mechanisms. Their work addresses limitations in previous analyses that used tailored models, which often obscured the security levels achieved. The study reveals that Signal’s existing protocols, X3DH and PQXDH, do not meet optimal security standards. In response, the authors propose RingXKEM, a fully post-quantum handshake protocol that achieves optimal security by efficiently sharing states among prekey bundles. This advancement provides a clearer understanding of the security landscape for Signal’s protocols and facilitates better comparisons among them.

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