Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

1. Symmetric encryption (using passphrase).

   gpg -c file
   

2. Decrypt a symmetric encrypted file. You will be prompt to enter your passphrase.

   gpg file.gpg
   

3. You can use the following command to encrypt a file as ascii armor.

   gpg -a -c file
   

4. You can specified the password using the --passphrase option to avoid keyboard interaction. You have to quote (in double/single quotation marks) the password if it contains white spaces. And you when you quote the password in double/single quotation marks, the double/single quotation marks can be escaped as usual by \"/\'.