New answers tagged ubuntu
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You can simply use gpg or openssl to encrypt your a single text file.
gpg -cipher-algo <cipher-algorithm> -c /path/to/file
List of posiible cipher can be known from gpg --help
openssl enc <cipher-algorithm> -in /path/to/file -out /path/to/encrypted/file
List of possible ciphers can be known via openssl enc -list.
No idea about integreted text ...
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7zip encryption is pretty bad from a security perspective (missing salt, self-made key derivation...), see e.g. this review.
I don't know of any program that encrypts files and has an integrated text editor, but there are numerous programs for encrypting individual files: Cryptomator, AES Crypt, File Lock PEA, EncFS...
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Feren OS is a British-made Linux Distribution based on Ubuntu, aiming at stability.
(But my limited experience with it remains limited, as the installer froze in live session, so I gave up.)
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