Read the FAQ: > The link is filtered by a question. Depending on the level of surveillance you think you are in, the question can be a simple captcha to avoid

Read the FAQ: > The link is filtered by a question. Depending on the level of surveillance you think you are in, the question can be a simple captcha to avoid bots, a secret question that your correspondent can answer but not the NSA, or a request for a password previously exchanged with your correspondent, or no question at all. > Your correspondent will have a web interface to answer your message privately. You can also activate a permanent HTTPS interface for anyone to send you a message privately at any time. Granted, 100% secure is a bold claim, but it's not just an HTTPS link anyone can click on, at least not if you're a tiny bit clever enough to enable additional protection it offers.