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A group of enthusiasts at Bletchley Park, the top secret wartime codebreaking base, have rebuilt a primitive computing device used in the Second World War to help the Allies listen in on U-boat conversations. It was called 'the Bombe'. air jordan banned 1 ebay charge on credit card
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The Bombe didn't help win the war destructively like its explosive name-sakes but using intelligence. It was designed to find the passwords or 'keys' into the secret codes of 'Enigma': the famous encryption machine used both by the German army in the field and to communicate to U-Boats in the Atlantic. It effectively allowed the English to listen in to the German's secret communications.

A Bombe is an electro-mechanical special purpose computing device. 'Electro-mechanical' because it works using both mechanics and electricity. It works by passing electricity through a circuit. The precise circuit that is used is modified mechanically on each step of the machine by drums that rotate. It used a set of rotating drums to mirror the way the Enigma machine used a set of discs which rotated when each letter was encrypted. The Bombe is a 'special purpose' computing device rather than a 'general purpose' computer because it can't be used to solve any other problem than the one it was designed for.

There are many explanations of why it's called a 'Bombe'. The most popular is that it is named after an earlier, but unrelated, machine built by the Polish to help break Enigma called the Bomba. The Bomba was also an electro-mechanical machine and was called that because as it ran it made a ticking sound, rather like a clock-based fuse on an exploding bomb.

The Enigma machine used a different main key, or password, every day. It was then altered slightly for each message by a small indicator sent at the beginning of each message. The goal of the codebreakers at Bletchley Park each day was to find the German key for that day. Once this was found it was easy to then decrypt all the day's messages. The Bombe's task was to find this day key. It was introduced when the procedures used by the Germans to operate the Enigma changed. This had meant that the existing techniques used by the Allies to break the Enigma codes could no longer be used. They could no longer crack the German codes fast enough by humans alone.

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Thank you to our expedition team for their passion enthusiasm about all things 'Antarctic'. Also fellow divers that shared lovely underwater images with 'landlubbers' like myself!

Eine Reise , die meine Frau und ich nie mehr vergessen werden. Unsere Erwartungen wurden bei weitem übertroffen. Egal ob es die Tierwelt oder die Natur betrifft. Man kann die Reise nur schwer mit Worten...

extraordinary journey, excellent food, very silent and confortable ship, exceptional crew and staff!!! recommended

It was a wish my husband and I had to go to Antarctica, and this March we finally went. We had high hopes and we can only conclude that this journey exceeded all our expectetsions. We have never had such a magnificent...

Perfekt. Danke für das einmalige Erlebnis.

Exciting wonderful trip. Crew. Excellent

Our voyages are “expedition” style cruise. Our emphasis is on wildlife encounters, personal contact with the environs, visiting sites of historical interest and to a lesser extent scientific stations. Our actual program will vary to take best...

That is hard to say. It depends on the weather and constraints of time and distance. Depending on the voyage, you may spend several days aboard the ship, followed by a series of landings, each several hours long. On some cruises you land two or three...

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