Marking the birth of the modern-day Internet

Today is the 30th birthday of the modern-day Internet. Five years ago we marked the occasion with a doodle. This year we invited Vint Cerf to tell the story. Vint is widely regarded as one of the fathers of the Internet for his contributions to shaping the Internet’s architecture, including co-designing the TCP/IP protocol. Today he works with Google to promote and protect the Internet. -Ed.

A long time ago, my colleagues and I became part of a great adventure, teamed with a small band of scientists and technologists in the U.S. and elsewhere. For me, it began in 1969, when the potential of packet switching communication was operationally tested in the grand ARPANET experiment by the U.S. Defense Advanced Research Projects Agency (DARPA).

Other kinds of packet switched networks were also pioneered by DARPA, including mobile packet radio and packet satellite, but there was a big problem. There was no common language. Each network had its own communications protocol using different conventions and formatting standards to send and receive packets, so there was no way to transmit anything between networks.

In an attempt to solve this, Robert Kahn and I developed a new computer communication protocol designed specifically to support connection among different packet-switched networks. We called it TCP, short for “Transmission Control Protocol,” and in 1974 we published a paper about it in IEEE Transactions on Communications: “A Protocol for Packet Network Intercommunication.” Later, to better handle the transmission of real-time data, including voice, we split TCP into two parts, one of which we called “Internet Protocol,” or IP for short. The two protocols combined were nicknamed TCP/IP.

TCP/IP was tested across the three types of networks developed by DARPA, and eventually was anointed as their new standard. In 1981, Jon Postel published a transition plan to migrate the 400 hosts of the ARPANET from the older NCP protocol to TCP/IP, including a deadline of January 1, 1983, after which point all hosts not switched would be cut off.

From left to right: Vint Cerf in 1973, Robert Kahn in the 1970’s, Jon Postel

When the day came, it’s fair to say the main emotion was relief, especially amongst those system administrators racing against the clock. There were no grand celebrations—I can’t even find a photograph. The only visible mementos were the “I survived the TCP/IP switchover” pins proudly worn by those who went through the ordeal!

Yet, with hindsight, it’s obvious it was a momentous occasion. On that day, the operational Internet was born. TCP/IP went on to be embraced as an international standard, and now underpins the entire Internet.

It’s been almost 40 years since Bob and I wrote our paper, and I can assure you while we had high hopes, we did not dare to assume that the Internet would turn into the worldwide platform it’s become. I feel immensely privileged to have played a part and, like any proud parent, have delighted in watching it grow. I continue to do what I can to protect its future. I hope you’ll join me today in raising a toast to the Internet—may it continue to connect us for years to come.

Posted by Vint Cerf, VP and Chief Internet Evangelist

A tribute to Turing, the father of modern computing

“The past is a foreign country—they do things differently there.” It’s a saying that rings especially true in the world of technology. But while innovating requires us to focus on the future, there are times when it’s important to look back. Today—the 100th anniversary of Alan Turing’s birth—is one such moment.

Statue of Alan Turing at Bletchley Park

Turing’s life was one of astounding highs and devastating lows. While his wartime codebreaking saved thousands of lives, his own life was destroyed when he was convicted for homosexuality. But the tragedy of his story should not overshadow his legacy. Turing’s insight laid the foundations of the computer age. It’s no exaggeration to say he’s a founding father of every computer and Internet company today.

Turing’s breakthrough came in 1936 with the publication of his seminal paper “On Computable Numbers” (PDF).  This introduced two key concepts, “algorithms” and “computing machines”—commonplace terms today, but truly revolutionary in the 1930’s:

• Algorithms are, in simplest terms, step-by-step instructions for carrying out a mathematical calculation. This is where it all started for programming since, at its core, all software is a collection of algorithms.
• A computing machine—today better known as a Turing machine—was the hypothetical device that Turing dreamed up to run his algorithms. In the 1930’s, a “computer” was what you called a person who did calculations—it was a profession, not an object. Turing’s paper provided the blueprint for building a machine that could do any computation that a person could, marking the first step towards the modern notion of a computer.

Considering the role computers now play in everyday life, it’s clear Turing’s inventions rank among the most important intellectual breakthroughs of the 20th century. In the evolution of computing, all paths trace back to Turing. That’s why Turing is a hero to so many Google engineers, and why we’re so proud to help commemorate and preserve his legacy.

In 2010, Google helped Bletchley Park raise funds to purchase Turing’s papers so they could be preserved for public display in their museum. More recently, we’ve been working closely with curators at London’s Science Museum to help put on a stunning new exhibition “Codebreaker - Alan Turing’s Life and Legacy.” This tells the story of Turing’s vast achievements in a profoundly moving and personal way, through an amazing collection of artifacts—including items loaned by GCHQ, the U.K. government intelligence agency, never before on public display. Topics addressed include Turing’s early years, his code-breaking at Bletchley Park, his designs for the Pilot Ace computer, his later morphogenesis work, as well as his sexuality and death. The exhibition opened on June 21 and is well worth a visit if you’re passing through London in the next year.

And finally, we couldn’t let such a momentous occasion pass without a doodle. We thought the most fitting way of paying tribute to Turing’s incredible life and work would be to simulate the theoretical “Turing machine” he proposed in a mathematical paper. Visit the homepage today— we invite you to try your hand at programming it. If you get it the first time, try again... it gets harder!

Turing was born into a world that was very different, culturally and technologically, from ours—but his contribution has never been more significant. I hope you’ll join me today in paying tribute to Alan Turing, the forefather of modern computing.

Posted by Andrew Eland, Engineering Director, Google U.K.