![Digital Fortress.Brown, Dan9780552161251 Digital Fortress.Brown, Dan9780552161251](https://mylibrairie.ma/9671-large_default/digital-fortressbrown-dan.jpg)
National Security Agency, Fort Meade, Maryland: when the most powerful intelligence organization on earth's invincible code-breaking machine encounters a mysterious code it cannot break, it calls for 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 would cripple US intelligence.