The email account of founder John Young has also been compromised, as well as the site's official Twitter account.
And while the site and email are again under Young's control, the Twitter account isn't, and he was forced to open a new one in the interim.
In the tweets on the compromised Twitter account are to be believed, the attack was executed by Ruxpin and Sabu, two hackers belonging to the Kryogeniks hacking group.
As you might remember, Cryptome was hacked in October 2010, when all of its content was deleted by the attackers. At the same time, Young's main email account was also breached. At the time, Ruxpin contacted Wired and said that two other Kryogeniks members were responsible for the attack.
Young commented that the hack wasn't unexpected, but didn't elaborate on what he believes to be attackers' likely motivation. Instead, he linked to a document containing information (accurate or not) about a number of Kryogeniks members, including Ruxpin.