TheGuardian.com...

[Pat D]

...appears to be under cyber attack right now - none of the browsers on my boxes can get through and I'm being told - by the browsers - that the certificates are no longer valid and that somebody is intercepting my attempt to go there.

Not at all surprising after reading

The Snowden Files by Luke Harding "The Inside Story of the World's Most Wanted Man"
Hacker, Hoaxer, Whistleblower, Spy by Gabriella Coleman "The Many Faces of Anonymous"
This Machine Kills Secrets by Andy Greenberg "How WikiLeakers, Cypherpunks, and Hacktivist Aim to Free the World's Information

You'll lose any respect you have left for your governments after reading these.

[NoahsArk]

Not need to worry. It is back to normal now. I had the same fault on Chromium and Firefox.