Explore the intricacies of TLS cryptography in this comprehensive conference talk from ACCU 2022. Delve into the mechanisms behind secure computer connections to banks, social media platforms, and other online services. Learn about AES, GCM, X25519, and ChaCha protocols, and understand the elements involved in establishing a TLS connection. Gain insights into the definition of "secure" in the context of online communications. Led by Peter Bindels, a principal software engineer at TomTom, this talk is tailored for programmers interested in C++ and operating system development, offering a deep dive into the workings of cryptographic systems without touching on cryptocurrencies or blockchain technology.