XAES-256-GCM

About a year ago I wrote that “I want to use XAES-256-GCM/11, which has a number of nice properties and only the annoying defect of not existing.” Well, there is now an XAES-256-GCM specification. Had to give up on the /11 part, but that was just a performance optimization. XAES-256-GCM is an...

I want XAES-256-GCM/11

In 2023, the way to use AES is AES-GCM. Anything else is very unlikely to make sense. We might not like that, we might wish OCB hadn't been patented, but with hardware support in most processors these days GCM is both faster than the alternatives, ubiquitous, and just tolerable to implement. Stil...