Certain top secret documents have been discovered during renovations at Bletchley Park, the celebrated wartime code breaking centre. It is said that these documents were used to break the Enigma Code.

It is said that these cache of papers include the only known examples of "Banbury sheets". This was a technique that was especially devised by the mathematician Alan Turing with an aim to accelerate the process of decrypting Nazi messages.

The mathematical process involved is known as 'Banburismus' and it was devised by Turing in 1940. The motive behind it was to infer information about the probable daily setting on the naval Enigma machine which is a device that is used by the Germans to encode messages.

Basically this technique involved punching holes in long sheets of paper and this was the representation of different cipher messages. In this machine two sheets were aligned and were placed over a light box. In case the two holes coincided then light shone through it indicated a match, from which the likely rotor settings could be deduced.

Mr. Iain Standen, Chief Executive Officer said, "Discovering these pieces of code-breaking ephemera is incredibly exciting and provides yet more insight into how the codebreakers actually worked. The fact that these papers were used to block draughty holes in the primitive hut walls reminds us of the rudimentary conditions under which these extraordinary people were working".

Gillian Mason, Bletchley Park curator stated that the actual documents used by codebreakers and in terms of the code breaking process are pivotal. Also, there is a lot of pencil and crayon activity. The codebreakers undoubtedly shortened the conflict and provided intelligence that eventually proved to be crucial in winning the Battle of the Atlantic against the U-boats.