PGP and/or GPG

use gpg or gpg2 or gpg1 according to the environment.

Encrypt Files

$ gpg -r Euron -ea filename.txt # use public key and output ascii. use this option.

        or

$ gpg -c filename.txt # use symmetric and output binary

       or

$ gpg -ca filename.txt # use symmetric and output ascii

Manage Keys

export public  key.

$  gpg2 --output  <key_file_name> --armor  --export Euron

export secret key.

$  gpg2 --output  <key_file_name> --armor  --export-secret-keys  Euron

import

$ gpg2 --import  <key_file_name>