gpg and crpn

[Arsha Bertie]

Hi, 

i have been trying to run a script which encrypts and transfers files
between 2 branches, i am using gpg for encryption, i have written a bash
script and the script is working perfectly fine, but when i run it off a
cron it doesnt want to work. 

i have written a small bash script for testing to run off cron, 

#!/bin/sh
gpg --output /backup/cronsuccess.gpg --recipient greg --encrypt
/backup/file



The cron tab looks like this

SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
HOME=/

# run-parts
01 * * * * root run-parts /etc/cron.hourly
02 4 * * * root run-parts /etc/cron.daily
22 4 * * 0 root run-parts /etc/cron.weekly
42 4 1 * * root run-parts /etc/cron.monthly

30 * * * * root /backup/encrypt.sh > /tmp/ab.log
~


Thr log file /tmp/ab.log is created after the cron executes but it is an
empty file. 
/var/log/cron also says that the cron is running, but the script is not
executed and the encryption doesnot take place. 

I am using Rehat9 and i am runnig the cron as root,

i dont know what else to do to run this script, please can anyone tell
me how to get gpg running from cron
i have been batteling with this for days....
If it is not possible to run it off a cron is there some other possible
way to get this done. 


Thanks in advance