FREE: Digital Fortress by Dan Brown

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Paper Back one owner.
When the NSA’s most classified technological wonder–an invincible code-breaking machine–encounters a mysterious code it cannot break, the agency calls in its head cryptographer, Susan Fletcher, a brilliant and beautiful mathematician. What she uncovers sends shock waves through the corridors of power.

The NSA is being held hostage… not by guns or bombs, but by a code so ingeniously complex that if released it will cripple U.S. intelligence. The book explores the theme of government surveillance of electronically stored information on the private lives of citizens, and the possible civil liberties and ethical implications.