您使用什么系统来加密一组人的文件（OS不可知的首选）？

Say you have a bunch of files. Say you can store meta data to these files. Say, one of these meta attributes were called "encryption" Say everyone was allowed to look at these files, but since they are encrypted, only people who know how to decrypt them can actually read the contents. Say, for every given value of "encryption", a group of people share the knowledge on how to decrypt files marked with that value. Say you want to be able to do this programmatically, in an OS agnostic way (if possible)Say you have a bunch of files. Say you can stor