Secure messaging protocols allow users to communicate asynchronously over untrusted channels with strong guarantees of privacy, authenticity, forward secrecy, and post-compromise security. However, traditional security analyses of these protocols assume complete trust in the hardware and software of honest participants, overlooking a significant class of real-world threats known as subversion attacks. These attacks alter cryptographic algorithms to compromise security, by exfiltrating secrets or creating vulnerabilities that are often undetected. The notion of reverse firewalls (EC’15), aims at protecting against subversion attacks by introducing a third party, called a “reverse firewall” (RF), which sits between a party and the outside world and modifies its outgoing and incoming messages in a way such that, even if the party’s machine has been corrupted (in a way that maintains functionality), security is still preserved. Importantly, the firewall shares no private information with the parties, and parties put no more trust in the firewall than they do in the communication channel. In this work, we address the existing gap in secure messaging and subversion attacks by presenting several key contributions: