Comment by sheepybloke

> battle-tested like TLS instead of reinventing data encryption

Working in the industry, CCSDS SDLS is quite battle tested, albeit in a different way than TLS. It's not reinventing everything from scratch; in most cases, companies have common libraries and services that they've been using since the 90's that implement the standards. I found it interesting that a lot of the CCSDS standards sound a lot like internet standards because many were developed alongside the internet standards, just targeting constrained space systems rather than ground systems.

TLS is difficult because it doesn't work well when you get to large latencies (e.g. 700ms in LEO to ~1.5s in GEO). CCSDS standards target general space systems, so they have to account for that latency.