If you are a certSIGN user, you may login here:

Login
Avoid having to verify your email address,
and drop-off files to non-certSIGN users.
 

Anyone may perform the following activities:

Pick-up
Pick-up (download) a file dropped off for you.
 
certSIGN users: you may login with your username and password and send files to anyone, in or out of certSIGN.
Non-certSIGN users: you cannot log in, but can still send files to certSIGN users if you know their email address. Start by clicking the "Drop-off" button.
certSIGN users who wish someone outside certSIGN to send them files, can make it a lot easier for them by logging in and clicking "Request a Drop-off". That saves the other person having to prove who they are. The request created will be valid for 7 days.
 
transfer is a service to make it easy for you to move files, including large files up to 20.0 GB, in and out of certSIGN.
 
How secure is transfer?

Files are automatically deleted from transfer 5 days after you upload them.