Creating CAPTCHA

Creating CAPTCHA

In 2000, as the internet expanded, websites faced a growing challenge to stop spam bots from flooding their systems.

To separate humans from machines, researchers at the United States’ Carnegie Mellon University in Pittsburgh, Pennsylvania, created the Completely Automated Public Turing test.

From its early development to its evolution into reCAPTCHA it continues to block millions of automated attacks every day.

Ashley Byrne speaks to computer scientist Andrei Broder, who played a key role in developing the concepts that helped shape this technology.

A Made in Manchester production.

Eye-witness accounts brought to life by archive. Witness History is for those fascinated by the past. We take you to the events that have shaped our world through the eyes of the people who were there. For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more. Recent episodes explore everything from the death of Adolf Hitler, the first spacewalk and the making of the movie Jaws, to celebrity tortoise Lonesome George, the Kobe earthquake and the invention of superglue. We look at the lives of some of the most famous leaders, artists, scientists and personalities in history, including: Eva Peron – Argentina’s Evita; President Ronald Reagan and his famous ‘tear down this wall’ speech; Thomas Keneally on why he wrote Schindler’s List; and Jacques Derrida, France’s ‘rock star’ philosopher. You can learn all about fascinating and surprising stories, such as the civil rights swimming protest; the disastrous D-Day rehearsal; and the death of one of the world’s oldest languages.

(Photo: I am not a robot. Credit: Stock image / Vector Illustration)

Jaksot(2000)

The Assassination of Ngo Dinh Diem

The Assassination of Ngo Dinh Diem

The president of South Vietnam was overthrown and murdered in a coup in November 1963 - with the support of the American government.Lucy Burns speaks to Ngo Dinh Diem's niece Elisabeth Nguyen Thi Thu Hong, and American official Rufus Phillips.Picture: Keystone/Getty Images

22 Marras 20178min

The Man Who Prosecuted Charles Manson

The Man Who Prosecuted Charles Manson

Charles Manson's followers murdered nine people on his orders. But how to prove his guilt when he wasn't on the scene at the time of the killings? Vincent Bugliosi was the young prosecutor who succeeded in bringing him to trial. Mr Bugliosi spoke to Chloe Hadjimatheou for Witness - the former prosecutor died in 2015.Photo: Charles Manson in 2009. Credit: Getty Images.

21 Marras 20178min

The Siege of Mecca

The Siege of Mecca

In 1979 Islamic militants seized control of the Grand Mosque in Mecca, the holiest site in Islam. Hundreds were killed as Saudi security forces battled for two weeks to retake the shrine. The militants were ultra-conservative Sunni Muslims who believed that the Mahdi, the prophesied Redeemer, had emerged and was a member of their group. The BBC's Eli Melki spoke to eyewitnesses who were inside the Grand Mosque during the siege. Photo: Fighting at the Grand Mosque in Mecca after militants seized control of the shrine, November 1979 (AFP/Getty Images)

20 Marras 20179min

Botswana's Diamonds

Botswana's Diamonds

Manfred Marx was the man who discovered the diamonds which transformed Botswana's economy. As a young geologist in 1967 his find in the Kalahari desert completely changed the country's fortunes after independence.(Photo: Uncut diamonds. Credit: Getty Images)

17 Marras 20178min

The 'Disappeared' of Lebanon

The 'Disappeared' of Lebanon

Thousands of people went missing during Lebanon's long and brutal civil war. But in 1982 a group of women started an organisation to try to track down their family members. Nidale Abou Mrad has been speaking to Wadad Halawani whose husband was taken from their home by two gunmen and never came back.Photo: West Beirut under shellfire in 1982.(Credit:Domnique Faget/AFP/Getty Images)

16 Marras 20178min

The Windmill Theatre

The Windmill Theatre

A British national institution closed in October 1964. The Windmill Theatre had been one of the few places where it was possible to see naked women on stage, due to a loophole in the censorship laws. Lucy Burns speaks to former Windmill Girl Jill Millard Shapiro about her memories of performing at the theatre.Picture:

15 Marras 20178min

The British Love Affair with Curry

The British Love Affair with Curry

Curry first became popular in the UK in the 1950s with the arrival of immigrants from South Asia. They introduced spicy food to the British diet. Nina Robinson has been speaking to Nurjuman Khan, an early pioneer of the Indian restaurant business in the English Midlands. His story also forms part of the 'Knights of the Raj' exhibition in Birmingham by Soul City Arts. Photo: A youthful Nurjuman Khan (Credit: Nurjuman Khan)

14 Marras 20179min

The Exploding Whale

The Exploding Whale

A dead sperm whale washed up on a beach in Florence, Oregon in November 1970. It was so big that the authorities decided to blow it up - with disastrous consequences. Years later, a local news report about the story resurfaced in the early days of the internet, and became one of the most famous viral videos ever. Lucy Burns speaks to Paul Linnman, the reporter behind the story.Picture: a sperm whale washed ashore in Skegness, England in January 2016 (Dan Kitwood/Getty Images)

13 Marras 20178min

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