The official website of the British Royal Navy has been hacked, with usernames and passwords posted on the internet.
The attack on http://www.royalnavy.mod.uk is the work of a hacker calling himself TinKode, who appears to come from Romania.
TinKode posted details of the hack, which was carried out late on Friday night, in a blog post on the web site Bay Words. A log revealing the details he uncovered about the Navy website, including usernames and passwords of administrators, is available here.
From a quick squint at his blog, TinKode's been a busy boy, with hacks on news agency Reuters, a number of US military sites, and the US National Weather Service to his credit.
At the time of writing, the Royal Navy's web site is still unavailable, and has been replaced with a static image including a message stating: "Unfortunately the Royal Navy website is currently undergoing essential maintenance. Please visit us again soon."
TinKode claims on his Twitter account to be a so-called 'grey hat' hacker, using illegal means to highlight security flaws without carrying out malicious attacks.
But his incursion will still come as a major embarrassment for the MoD, which last month declared that protecting against cyber attacks was a "highest priority for UK national security" in the newly unveiled National Security Strategy.