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Jim Cowie
Chief Technology Officer and Co-founder, Renesys

Jim Cowie, Chief Technology Officer, is responsible for technology thought leadership, innovation and technology strategy for the company.

Jim has more than 15 years entrepreneurial and software development experience in high performance computing, network modeling and simulation, web services, and security. Prior to founding Renesys, Jim was a principal at Cooperating Systems, a consulting services company that provided rapid software prototyping and technology planning for advanced research and development in academia and industry. With a long standing interest in the Internet’s impact on security and collaboration since 1995, he authored the first web-based collaborative environment for cryptographic key factoring. Jim is the primary architect of SSFNet, the first open-source network simulation framework to support transparent parallelization and multiprocessor execution. Jim holds a B.S in computer science from Yale University.

Entries by Jim Cowie

The Battle for Tripoli's Internet

(0) Comments | Posted August 21, 2011 | 11:37 PM

As dawn broke in Libya on the morning of Sunday 21, August, it appeared that the battle for control of Tripoli was underway. Throughout the night, a steady stream of tweets and retweets emerged from Libyan sources, painting a confusing, often contradictory picture of the evolving situation....

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Syrian Internet Shutdown

(0) Comments | Posted June 3, 2011 | 3:12 PM

Starting at 3:35 Coordinated Universal Time (UTC) today (6:35am local time), Renesys observed that approximately two-thirds of all Syrian networks became unreachable from the global Internet. Over the course of roughly half an hour, the routes to 40 of 59 networks were withdrawn from the global routing table.

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What Libya Learned From Egypt

(37) Comments | Posted March 5, 2011 | 11:33 AM

Libya's nationwide Internet blackout is entering its second full day. From a technical standpoint, it's clear that this is a very different strategy than the one used by Egypt in the last days of the Mubarak regime. The ultimate outcome is probably going to be the same. Let's take...

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The Resilience of Egypt

(2) Comments | Posted February 9, 2011 | 4:15 PM

For years, the internet community has monitored the evolution of online communication restrictions imposed by governments such as Iran and China. On 28 January, Egypt raised the bar on censorship with its "kill-switch" strategy, eliminating internet connectivity and suppressing data communications nationwide for five days.

Against such...

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Egypt Returns to the Internet (Chart)

(3) Comments | Posted February 2, 2011 | 8:31 AM

Renesys can confirm that Egyptian Internet providers returned to the Internet at 09:29:31 UTC (11:29am Cairo time). Websites such as the Egyptian Stock Exchange, Commercial International Bank of Egypt, MCDR, and the US Embassy in Cairo, are once again reachable.

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Egypt: A Hole in the Internet (Video)

(0) Comments | Posted February 1, 2011 | 6:01 PM

Even before their communications blackout, Egypt really was a small part of the Internet in absolute terms, just a few thousand routable networks out of nearly 400,000 making up the global IPv4 address space.

To illustrate the point, we put together these images, which use a Hilbert curve...

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