password protecting a file

From: Andy Fish (ajfish_at_blueyonder.co.uk)
Date: 02/29/04 

Date: Sun, 29 Feb 2004 10:11:03 GMT

Hi,

I am using debian woody linux and I'm after a simple command line program to
password protect a file (symmetrical encryption)

I'm not after world beating levels of security, just comething to obscure
the data from a casual observer (better than rot13 though)

On solaris there used to be a program called "encrypt" I think but I don't
know what the underlying technology was.

Is there anything like this included or freely available?

many thanks

Andy