Right now, GnuPG is absolutely safest for individual files. There’s no age client for Android, and while I like it, I am allergic to encryption systems without a robust ecosystem.
Someone else just pointed out that DroidFS can read gocryptsfs directories, which greatly expands my confidence in gocryptsfs - which is my preferred short term directory solution. For archival purposes, though, tar+gpg is the only thing I trust to be available and working in a decade.
Right now, GnuPG is absolutely safest for individual files. There’s no age client for Android, and while I like it, I am allergic to encryption systems without a robust ecosystem.
Someone else just pointed out that DroidFS can read gocryptsfs directories, which greatly expands my confidence in gocryptsfs - which is my preferred short term directory solution. For archival purposes, though, tar+gpg is the only thing I trust to be available and working in a decade.