To extend another tool for xcommands with encryption capability I modified my xcommand cgi and named it xcommsec. It is available at
ftp://ftp.pure.ch/smartlist/
For the usage of xcommsec it is required to install xc_sec, available at the same URL and to use something like TLS/SSL to have a secure connection to the script.
BTW: Anyone on the list knows of other MLM with mechanismn like xcommand. If there are some, how do they handle the authentification. Do they also send cleartext passwords?
Werner