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with Hugh Price, president of the National Urban League, and Tracy Parsons, president, Urban League of Champaign County

with author Walter Johnson, professor of history and American studies, New York University

with Marshall Martin, Director, Center for Agricultural Policy and Technology Assessment, Purdue University; and H. Leon Thacker, professor of veterinary pathology, Purdue University

with author Shana Alexander

Guests: Nigel Boston and Simon Singh.

Public key crypography is a system for maintaining privacy in communications that has allowed the information age to flower. Until recently, the true story of its invention was kept secret by the British government. Today on Focus, we're joined by journalist Simon Singh and expert Nigel Boston to hear the full story.