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Linux: HowTo Encrypt And Decrypt Files With A Password

To encrypt and decrypt files with a password, use gpg command. It is an encryption and signing tool for Linux and UNIX-like operating systems such as FreeBSD, Solaris, MacOS and others. Gnupg is a complete and free implementation of the OpenPGP standard.
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SSH Public Key Based Authentication – Howto

The SSH protocol is recommended for remote login and remote file transfer which provides confidentiality and security for data exchanged between two computer systems, through the use of public key cryptography. The OpenSSH server provides this kind of setup under Linux. It is installed by default. This how-to covers generating and using ssh keys for automated usage such as:

  1. Automated Login using the shell scripts.
  2. Making backups.
  3. Run commands from the shell prompt etc.

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