What I want to achieve:
I intend to burn a few dozen of single-layer Blu-Rays, 25GB, M-Discs with data that are precious to me in an encrypted form.
The hardware needed - Blu-Ray writer and the M-Discs - I already have.
I have chosen AES-256 as the encryption method for the data.
Operating systems / platforms which has to be supported by the solution:
Linux Mint (18)
GNU/Linux Debian (9)
Cygwin (on Windows 10)
This may or may not change in the future; let's suppose it would change rather than not.
What software would you recommend me to do the storage?
The conditions follow:
The data can't be compressed further, so no compression needed.
Generic Linux and Cygwin access needed.
I would rather have individual files encrypted, than for instance one VeraCrypt containter for everything.
It should have a CLI (command-line interface) so that I could decrypt it on a headless server too.
I think 7-zip with no compression option could do this job well, but I rather ask before I could make a mistake, I would regret later on.
7-zip is open-source,
I compile it myself on my Linuxes
It supports AES-256
It has CLI interface
I forgot to tell you how far to the future I am looking: about 20 years.