iX3DH: Post-Quantum Subversion-Resilient X3DH Key-Exchange from Isogenies

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Secure messaging runs on commodity devices that can be subverted by malware or supply-chain attacks. Reverse firewalls address this threat by interposing a user-side device that mediates the communication of a potentially compromised end-point. Recently, Dodis et, al. (CRYPTO 2025) proposed a reverse firewall design for protecting Signal, including its Diffie-Hellman based X3DH handshake, against subversion. With Signal and other platforms now migrating to post-quantum cryptography, however, ext