Encryption commands such as gpg can be used to secure your most sensitive files on Linux systems.

GnuPG, the open replacement for PGP, is an excellent tool to manage cryptographic signatures to files or e-mails for validity and integrity, as well as a tool to encrypt and decrypt sensitive ...

This will create the file myfinancial.info.gpg. Note that the original file is not deleted, so once you feel safe encrypting and decrypting files, you probably want to delete your unencrypted versions ...