encrypt file on stock system

[Alan Mead <adm ipat com>]

Is there a way to encrypt a file fairly securely which can be decrypted 
from the command line using only stock software?  I want to send an HTML 
file to a number of Linux users and I cannot presume that they will have 
any particular security tools besides what the distribution provides.

I seem to have two files which might accomplish this on my RH 6.1 system, 
gpg and cryptdir.  I think I installed gpg separately but have no 
recollection of installing the second.

Thanks!

-Alan
---
Alan Mead, Ph.D.  /  Research Scientist  /  adm ipat com
Institute for Personality and Ability Testing
1801 Woodfield Dr  /  Savoy IL 61874 USA
217-352-4739 (v)  /  217-352-9674 (f)