how to create a symmetric cipher

[Wei Wu [H]]

Hi there,

I want to create a symmetric cipher such as AES to encrypt some data, and
think gpg (GnuPG Version 1.4.2.1) may do this. But I found it gives only
three options, none is symmetric. I would appreciate if anyone can point me
to another or way to do it?

Regards,
WW

gpg --gen-key 
   (1) DSA and Elgamal (default)
   (2) DSA (sign only)
   (5) RSA (sign only)