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Use openssl to encrypt /decrypt a file

 # enc (use the encryption module)
 # -e (encrypt)
 # -d  (decrypt)
 # -in input_file
 # -out output_file
 # -aes-256-cbc: encryption algorithm
 #

#~~~~~~~~
# Encrypt
#~~~~~~~~

openssl enc -e   -aes-256-cbc -in /tmp/file.txt -out  /tmp/foo.ciphered

#~~~~~~~~
# Decrypt
#~~~~~~~~

openssl enc -d   -aes-256-cbc -in /tmp/foo.ciphered -out  /tmp/foo.txt