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The collaboration behind Colossus

CRI-117When I first heard about the heroic efforts during WWII to break the Nazi communications codes such as Enigma, I had in my mind the image of a lone cryptanalyst with pencil and paper trying to figure out solutions, or using a series of mechanical devices such as the Bombe to run through the various combinations.

But it turns out I couldn’t be more wrong. The efforts of the thousands of men and women stationed at Bletchley Park in England were intensely collaborative, and involved a flawless execution of a complex series of steps that were very precise. And while the Enigma machines get a lot of the publicity, the real challenge was a far more complex German High Command code called Lorenz, after the manufacturer of the coding machines that were used.

The wartime period has gotten a lot of recent attention, what with a new movie about Alan Turing just playing in theaters. This got me looking around the Web to see other materials, and my weekend was lost in watching a series of videos filmed at the National Museum of Computing at Bletchley Park.  The videos show how the decoding process worked using the first actual electronic digital computer called Colossus. Through the efforts of several folks who maintained the equipment during wartime, the museum was able to reconstruct the device and have it in working order. This is no small feat when you realize that most of the wiring diagrams were immediately destroyed after the war ended, for fear that they would fall into the wrong hands. And that many people are no longer alive who attended to Colossus’ operations.

The name was realistic in several ways: first, the equipment easily filled a couple of rooms, and used miles of wires and thousands of vacuum tubes. At the time, that was all they had, since transistors weren’t to be invented for several years. Tube technology was touchy and subject to failure. The Brits figured out that if they kept Colossus running continuously, they would last longer. It also wielded enormous processing power, with a CPU that could have had a 5 MHz rating. This surpassed the power of the original IBM PC, which is pretty astounding given the many decades in between the two.

But the real story about Colossus isn’t the hardware, but the many people that worked around it in a complex dance to input and transfer data from one part of it to another. Back in the 1940s we had punch paper tape. My first computer in high school had this too and let me tell you using paper tape was painful. Other data transfers happened manually copying information from a printed teletype output into a series of plug board switches, similar to the telephone operator consoles that you might recall from a Lily Tomlin routine. And given the opportunity to transfer something in error, the settings would have to be rechecked carefully, adding more time to the decoding process.

There is an interesting side note, speaking about mistakes. The amount of sheer focus that the Bletchley teams had on cracking German codes was enormous. Remember, the codes were transmitted over the air in Morse. It turns out the Germans made a few critical mistakes in sending their transmissions, and these mistakes were what enabled the codebreakers to figure things out and actually reconstruct their own machines. Again, when you think about the millions of characters transmitted and just finding these errors, it was all pretty amazing.

What is even more remarkable about Colossus was that people worked together without actually knowing what they did. There was an amazing amount of wartime secrecy and indeed the existence of Colossus itself wasn’t well known until about 15 or 20 years ago when the Brits finally lifted bans on talking about the machine. For example, several of the Colossus decrypts played critical roles in the success of the D-Day Normandy invasion.

At its peak, Bletchley employed 9,000 people from all walks of life, and the genius was in organizing all these folks so that its ultimate objective, breaking codes, really happened. One of the principle managers, Tommy Flowers, is noteworthy here and actually paid for the early development out of his own pocket Another interesting historical side note is the contributions of several Polish mathematicians too.

As you can see, this is a story about human/machine collaboration that I think hasn’t been equaled since. If you are looking for an inspirational story, take a closer look at what happened here.


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More Stories By David Strom

David Strom is an international authority on network and Internet technologies. He has written extensively on the topic for 20 years for a wide variety of print publications and websites, such as The New York Times, TechTarget.com, PC Week/eWeek, Internet.com, Network World, Infoworld, Computerworld, Small Business Computing, Communications Week, Windows Sources, c|net and news.com, Web Review, Tom's Hardware, EETimes, and many others.

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