Hide command details in top?

I am pulling data from remote SFTP server via LFTP. I really like its features.

I have executed following command through screen.

lftp -u xxxxx,xxxxx -e "set sftp:connect-program 'ssh -a -x -i /sftp/user/downloads/.ssh/id_dsa';mirror -vvv -c /data/ /sftp/user/downloads/2014_ic; quit" sftp://x.x.x.x:22 >> /home/test/lftp_ic_get_logs_20140913

But anyone can see the credentials through the process details.
How would I hide certain sections of the command?
Is it possible via script that we can hide the entire command details?

TIA...

I'm not familiar with lftp, but looking at the manual pages, it suggests you can use a command file. Can you add a user statement in there and therefore remove it from the command line? Of course, you would need to ensure that no-one else can read the command file......

Robin