DARPA Shredder Challenge 2011

The aim of the challenge was to "assess potential capabilities that could be used by the U.S. warfighters operating in war zones, but might also identify vulnerabilities to sensitive information that is protected by shredding practices throughout the U.S. national security community".

[6][7][8] The team used a combination of techniques to solve the puzzles: custom-coded computer-vision algorithms were created to suggest fragment pairings to human assemblers for verification.

[5] The eight-person team led by a technology entrepreneur Otavio Good also included Keith Walker, Winnie Tong, Luke Alonso, Zina Tebaykina, and Sohana Ahmed with two more persons joining to help in the end.

[3] The team's three programmers had strong image-processing skills that enabled them to win this challenge: at the time of DARPA Shredder Challenge 2011, Otavio Good was leading the development of the visual translation tool Word Lens, Luke Alonso was a developer of the mobile phone application "Cabana", and Keith Walker was a programmer working on a satellite software at Lockheed Martin.

University of California, San Diego (UCSD) reconstructed three puzzles through an online crowdsourcing approach, but their work-in-progress was repeatedly sabotaged.