Login from other website

Hi,

Trying my luck here again as you have set me on the right track before.
I am trying to login a user into the RT web interface as he or she
authenticates on another website. After successful authentication there
I can get an encrypted username and password to my website, decrypt it
and then … I need to trigger the login functionality of RT somehow.

I tried quite some things with PHP (cURL, snoopy etc) and even
JavaScript to submit the login form without pressing the submit button,
but I do not seem to be able to get those approaches to deliver.

Maybe, pretty likely actually, I am overseeing an easy option and one of
you can give me a push in the proper direction. I do know some PHP but
PERL so far is not my cup of coffee.

Thanks a lot!

– Jac