Skip to main content

Alan Turing and "The Imitation Game"

Executive Summary

The Alan Turing story is so fantastic that it was inevitable that somebody should make a movie about it. His life is both inspiring and terrifying. I am amazed at the paradigm-shifting insights Turing gave to the world in such a short time and appalled at what the world did to him because of ignorance and the need to keep secrets hidden from the world. I have a soft spot for genius scientists anyway, but because of his meteoric rise and subsequent spectacular crash to the ground, Alan Turing is one of my favorites. The movie, The Imitation Game, brings that story to the masses and Cumberbatch’s performance makes Turing accessible; makes him a hero. You should see this movie.


The Imitation Game is good and I am so happy that it is. The movie is a dramatization of my all-time favorite science hero: Alan Turing. I first discovered Turing’s story of world-changing achievement and heartbreaking tragedy when I read Neil Stephenson’s Cryptonomicon back in the late 1990s. Cryptonomicon is the best hacker novel of all time, in my humble opinion, and Stephenson uses the real-world Turing to influence one of his fictional characters in the story. [1] These days, the word “genius” is thrown around to describe all manner of individuals that excel. But the scientific world reserves the use of “genius” for the giants; people like Da Vinci, Newton, Einstein, and I would say Turing.

Alan Turing

In his short life (1912-– 1954), Turing accomplished so much and pushed the boundaries of what we would today call the computer age that the set of scientists I would put in his peer group is very small. His “minor” accomplishments notwithstanding, he is responsible for three paradigm changing events in our world history: Inventing the Universal Turing Machine, [2] leading the code breaking efforts at Bletchley Park during World War II [3] and devising the Turing Test; [4] a test that still influences the scientific community today to decide if a computer can pass itself off as being an intelligent being. 

The Universal Turing Machine

My favorite accomplishment of his is the Universal Turing Machine. Back in the 1930s, Turing was thinking about Kurt Gödel’s Incompleteness Theorem [5] where Gödel proved the existence of certain mathematical problems that cannot be solved. This was controversial at the time since most scientists thought that math and science could, and would, eventually solve all problems. Turing wondered if there was a way for him to mechanically test all possibilities. He was inspired by the work of Alfred Whitehead and Bertrand Russell in their book Principia Mathematica where they rebuilt the language of math from the ground up using a small set of first principles. [6] They demonstrated a way to express all of math as a certain ordering of symbols. In a paper called, On Computable Numbers, with an Application to the Entscheidungsproblem, Turing’s great insight was that it was possible to change the function of a mechanical machine simply by changing the symbols you put into it. [7] That sounds easy when you say it fast, but think about the implications. 

With all computers, the brain behind making everything run is the Central Processing Unit (CPU). Not to simplify too much, but the basic function of the CPU is to move continuous streams of binary numbers, those symbols that Turing was talking about, between storage areas and add them together really, really fast. Because of Turing’s insight, the CPU can transform your computer into a high-end gaming machine capable of rendering three-dimensional World of Warcraft Orcs that are communicating with each other from around the world in one instant, and in another, re-transform the computer into a complex spreadsheet that calculates standard deviations from reams of data the size of your local library. Before Turing mathematically proved it in 1936, machines in the real world were mostly single purpose machines: the hammer, the wedge, the screw, the gas engine, etc. Turing proved that by changing the symbols you feed into a machine, you could change the function of the machine. [8] Genius! 

Bletchley Park

This led to Turing’s life-saving work helping to break Germany’s Enigma cipher machine during World War II. [9] Because of his leadership (and the efforts of many at Bletchley Park), the Allies essentially knew what the German forces were going to do before the German commanders in the field knew. One estimate puts the number of lives saved at Bletchley Park to be between 14 and 21 million. [3] He was a British national hero but because the work that he did was so highly classified, only a handful of people in the world knew it. This became a problem for him after the war and is one of the reasons behind Turing’s great tragedy. 

The Turing Test

In 1950, Turing published a paper called Computing Machinery and Intelligence where in the first sentence he states, “I propose to consider the question, ‘Can machines think?’ ” [10] He describes a thought experiment that he calls “The Imitation Game” where he puts a machine in one room, a person in another and judge in a third separate room. By reviewing the answers to written questions that he submits to both subjects, the judge’s job is to determine which subject is the machine and which subject is the human. Turing predicted that a machine might be able to win this Imitation Game 30% of the time by the year 2000. [11] Since the publication, modern scholars in many different fields have tried to poke holes in “The Turing Test” for being inadequate. They say that The Imagination Game does not go far enough in defining what a “thinking” digital computer really means. But as Mark Halpern wrote back in 2006, Turing’s paper became the seed from which future ideas have sprung. 

“[I]t has become one of the most reprinted, cited, quoted, misquoted, paraphrased, alluded to, and generally referenced philosophical papers ever published. It has influenced a wide range of intellectual disciplines — artificial intelligence (AI), robotics, epistemology, philosophy of mind — and helped shape public understanding, such as it is, of the limits and possibilities of non-human, man-made, artificial ‘intelligence.’ ” [12]

The Tragedy

Turing was gay and probably had Asperger’s disease and maybe autism. When the authorities discovered his sexual orientation after the war, they charged him with homosexuality. At the time, homosexuality was an official crime in Britain. Some speculate that Turing’s mental disorders caused him to be brutally honest when the police interrogated him about his sexual preference. [13] Because the work he did at Bletchley Park was so classified, nobody in the courtroom knew he was a national hero and none came to vouch for him. After the court convicted him, the judge gave him a choice for punishment: prison or chemical castration; a barbaric practice of forced estrogen injections intended to reduce the libido of homosexuals. Turing chose chemical castration. He grew breasts and because of his homosexuality, the British declared he was a security risk and kicked him out of the code-breaking program that continued after the war. More importantly, Turing himself thought the injections were affecting his ability to think. [14] It became too much for him. In 1954, Turing committed suicide by eating an apple dipped in Cyanide. [9] The man was 42 years old; still in his prime. Even with all of his legal difficulties, he still was able to develop the Turing Test for intelligence. Just think what he might have been able to do if the authorities left him alone or allowed him to continue his work at Bletchley Park. The mind boggles. 

The Movie

The Turing story is so fantastic that it was inevitable that somebody should make a movie about it. I must admit, I was a both little bit nervous about the project and full of anticipation for it too. I was nervous because I did not want Hollywood to besmirch my hero but I really wanted them to do it right so that more people would know about this inspiring man. I am here to tell you that they got it right. 

The movie is based on the book, Alan Turing: The Enigma written by Andrew Hodges. [15] As with all dramas that are “Based on a True Story,” the film crew took certain liberties with the facts in order to make the story more coherent and to add dramatic effect. In doing so, I think they absolutely captured the essence Dr. Turing’s personality and the significance of his three major accomplishments. This is quite amazing really since all three are highly technical, but the screenwriters, the director, and the actors adroitly kept the right balance between the technical and the dramatic to make the story compelling. 

Benedict Cumberbatch plays Turing and he absolutely personifies everything that I have learned about the man over the last 15 years. He realistically captures his autistic tics, embodies his social awkwardness, and wears his intellectual superiority to all around him like a second skin. But Cumberbatch also plays it in a way that the audience is immediately on his side. It helps to be playing opposite of Keira Knightly who plays Joan Clarke; an amazing woman in her own right and who stood side-by-side with the other cryptographers at Bletchley Park as an equal. In the movie, their relationship brings out the humanity in Turing. 

There is a thru-line in the movie that ties the three parts of the story together. It is said by three different people: Turing’s not-quite boyfriend when Turing was in boarding school as a boy, Turing as he hires Joan to work at Bletchley Park and Joan when she is comforting Turing after he has been on his forced chemical castration regimen.

“Sometimes it is the people who no one imagines anything of who do the things that no one can imagine.”

It is a great line, an emotional line, and a line that puts a spotlight on Turing’s humanity and brilliance for all to see.


In 1999, Time Magazine named Turing as one of the 100 Most Important People of the 20th century for his role in the creation of the modern computer. The editors said, 

"The fact remains that everyone who taps at a keyboard, opening a spreadsheet or a word-processing program, is working on an incarnation of a Turing machine." [16] 

Turing’s life is both inspiring and horrifying. I am amazed at the paradigm-shifting insights Turing gave to the world in such a short time and appalled at what the world did to him because of ignorance and the need to keep secrets hidden from the world. I have a soft spot for genius scientists anyway, but because of his meteoric rise and subsequent spectacular crash to the ground, Alan Turing is one of my favorites. The movie, The Imitation Game, brings that story to the masses and Cumberbatch’s performance makes Turing accessible; makes him a hero. You should see this movie.


[1] "Book Review: “Cryptonomicon” by Neal Stephenson (1999)," by Rick Howard, Terebrate, 8 December 2013, Last Visited 24 December 2013

[2] "A Turing Machine built using LEGO: In honor of the Alan Turing year 2012." by CWI, Last Visited 24 December 2013

[3] "Alan Turing: The codebreaker who saved 'millions of lives'," by Jack Copeland, 18 June 2012, Last Visited 24 June 2013,

[4] "How to Pass the Turing Artificial Intelligence Test," by Duncan Geere, Wired Magazine, 19 June 2012, Last Visited 24 December 2013,

[5] "Kurt Godel (1906-1978)," by The Exploratorium, 1996, Last Visited 24 December 2013

[6] "'Principia Mathematica' Celebrates 100 Years," by ROBERT SIEGEL, NPR, 22 December 2010, Last Visited 24 December 2013.

[7] “On computable numbers, with an application to the Entscheidungsproblem,” By Alan Turning, the London Mathematical Society, (Ser. 2, Vol. 42, 1937); Last Visited 15 January 2015,

[8] "Alan Turing: why the tech world's hero should be a household name," by By Vint Cerf, BBC News and Technology, 17 June 2012, Last Visited 24 December 2013,

[9] "The highly productive habits of Alan Turing," by Matthew Lasar, Ars Technica, 17 June 2012, Last Visited 24 December 2013.

[10] “COMPUTING MACHINERY AND INTELLIGENCE,” By A. M. Turing, Mind 49: 433-460, 1950, Last Visited 18 January 2015

[11] “How to Pass the Turing Artificial Intelligence Test,” By Duncan Geere, Wired Magazine, 19 June 2012, Last Visited 18 January 2015,

[12] “The Trouble with the Turing Test,” by Mark Halpern, The New Atlantis: A Journal of Technology and Society, Number 11, Winter 2006, pp. 42-63., Last Visited 18 January 2015

[13] "Alan Turing: Gay Autism Martyr," by Landon Bryce, thAutcast,com, June 2012, Last Visited 24 December 2013,

[14] "Alan Turing - Forgotten Hero," by phinea,, 10 January 2012, Last Visited 24 December 2013

[15] “Alan Turing: The Enigma,” by Andrew Hodges, Published by Walker & Company, 1 March 2000, Last Visited 28 January 2015

[16] "Computer Pioneer Alan Turing Pardoned of ‘Gross Indecency’," by Dan Kedmey, Time Magazine, 24 December 2013, Last Visited 24 December 2013,


“9 Secrets About The Imitation Game, Straight From Its Screenwriter,” BY ANGELA WATERCUTTER, Wired Magazine, 11 November 2014, Last Visited 18 January 2015,

"Alan Turing, British code-breaker castrated for homosexuality, receives pardon," by Jethro Mullen, CNN, 24 December 2013, Last Visited 24 December 2013,

“How 'The Imitation Game' cracks Alan Turing,” by OLIVER FRANKLIN, Wired Magazine, 17 NOVEMBER 14, Last Visited 18 January 2015,
"KONRAD ZUSE (1910-1995)," by Jürgen Schmidhuber, Last Visited on 24 December 2013


Popular posts from this blog

Books You Should Have Read By Now

When I started Terebrate back in January 2010, I always intended it to be a place to put my book reviews on whatever I was reading. Since then, a lot has happened in my professional life. I changed jobs, twice. I presented my collection of cybersecurity book reviews at the annual RSA Conference and suggested that the cybersecurity community ought to have a list of books that we all should have read by now. My current employer, Palo Alto Networks, liked the idea so much that they decided to sponsor it. We ended up creating the the Rock and Roll Hall of Fame for cybersecurity books. We formed a committee of cybersecurity experts from journalists, CISOs, researchers and marketing people who were all passionate about reading. My collection became the the candidate list and for the past two years, the committee, with the help of community voting, has selected books from the candidate list to be inducted into something we are calling the Cybersecurity Canon. It has been very exciting.

This i…

Book Review: Kingpin: How One Hacker Took Over the Billion-Dollar Cybercrime Underground by Kevin Poulsen (2011)

Executive Summary
Kingpin tells the story of the rise and fall of a hacker legend: Max Butler. Butler is most famous for his epic, hostile hacking takeover in August 2006 of four of the criminal underground’s prominent credit card forums. He is also tangentially associated with the TJX data breach of 2007. His downfall resulted from the famous FBI sting called Operation Firewall where agent Keith Mularski was able to infiltrate one of the four forums Butler had hacked: DarkMarket. But Butler’s transition from pure white-hat hacker into something gray—sometimes a white hat, sometimes a black hat—is a treatise on the cyber criminal world. The author of Kingpin, Kevin Poulsen, imbues the story with lush descriptions of how Butler hacked his way around the Internet and pulls the curtain back on how the cyber criminal world functions. In much the same way that Cuckoo's Egg reads like a spy novel, Kingpin reads like a crime novel. Cyber security professionals might know the highlights of…

Book Review: “We Are Anonymous: Inside the Hacker World of LulzSec, Anonymous and the Global Cyber Insurgency (2012)” by Parmy Olson

Executive Summary: 

This book is a must read for all cyber security professionals. It does not cover the entire Anonymous movement, but by focusing on the evolution of the Anonymous Franchise and the rise and fall of the LulzSec hacking group, Ms. Olson captures the essence of the hacktivist culture and what motivates its supporters. If you seek to understand the Hacktivist movement, this book is a primer.


The Anonymous Franchise really hit its stride between the years of 2010 and 2011. Hacktivism began earlier than that of course (1994 was the first documented case that I could find [12]), but it did not strike fear into the hearts of CEOs, CSOs and government officials until that two year run. It was the perfect storm of technology, disenfranchised youngish people, “Internet Pranks as an Art Form,” empowerment and the hacking culture that came together into a gigantic hairball of activity and energy that caused governments from around the world to double-clutch on some of th…