2026 Jul 28 See all posts Obfuscation (Part II): Diamond iO Special thanks to Sora Suegami and Janmajaya Mall for feedback and review. In the last part of this series, we went through the full tech tree of the most mainstream and conservative line of cryptographic obfuscation (iO) protocols. These protocols allow you to "encrypt" programs in such a way that anyone can run the "encrypted" program on plaintext inputs and get plaintext outputs, without being able to see the internal logic of the program. This can be used for all kinds of use cases, particularly situations where the program contains some secret key internally, and obfuscating accomplishes the goal of giving someone a package that lets them do some things with the secret key in some circumstances, but not anything else.…