Assange's insurance: Password to a 1.3Gb file of unfiltered leaks (theglobeandmail.com)

There is not enough energy in the sun to perform the instructions necessary to break AES256.

Source: http://tech.slashdot.org/article.pl?sid=09/07/01/2141226

"A device that could check a billion billion (1018) AES keys per second would in theory require about 3×1051 years to exhaust the 256-bit key space." - wikipedia

Unless there's a backdoor in the S-Box that no one knows about, it's pretty much impossible.