The Bletchley Park Trust has moved a step closer to beginning the restoration of the World War Two codebreaking huts at the Buckinghamshire site thanks to a £550,000 donation from Google.
The Trust need to raise match funding to earn a £4.6 million Heritage Lottery Fund grant to enable them to transform the site into a "world-class" heritage and education centre.
Peter Barron, director of External Relations for Google, said: "The Bletchley Park trust has been doing great work to honour Alan Turing and the code breakers who helped shorten the second world war and to educate the next generation about the history of modern computing.
"We are delighted to make this charitable donation to help support the next phase of this important project."
Once the remaining funding is in place the Trust can begin work on iconic codebreaking huts 1, 3 and 6, creating a visitor centre and exhibition in the currently derelict Block C.
"It would be wonderful if other donors follow Google’s example to help preserve our computing heritage," said the Trust's Simon Greenish.
"We could then proceed as soon as possible with restoration of the profoundly historically significant codebreaking huts."
The Trust is one of several dozen organisations receiving grants from Google.org at the end of 2011 as part of a $100 million total of charitable awards by Google this year.