Cobain reportedly was always insecure, questioning his worth as a person.
VOA: special.2009.11.06
The United Nations says nearly 60 percent of Afghanistan is insecure to a greater or lesser extent, and access in these areas is limited and risky.
VOA: standard.2009.08.07
As you can see in the screen shot below (from the Ars Technica article), you can provide links to your files (either containing the key so someone can access them directly or by providing them with the key separately) but you are prompted with a caution about not transmitting the keys through insecure channels and a far-reaching copyright warning.
That means when you click from an insecure tab in your browser to a secure one, the insecure site can wait until the user is on a trusted site and send a pop-up requesting the user download a plug-in.