Explore a 21-minute conference talk from Crypto 2016 on message transmission with reverse firewalls, presented by Yevgeniy Dodis, Ilya Mironov, and Noah Stephens-Davidowitz. Delve into the challenges of secure communication on corrupted machines, examining topics such as cryptographic software bugs, algorithm substitution attacks, and reverse firewall functionality. Learn about message-transmission protocols, perandomizable hybrid encryption, and composition theorems. Gain insights into the complexities of trusting computers in cryptographic operations and discover potential solutions for enhancing security in real-world scenarios.