Digital Fortress

When the National Security Agency s unbreakable code-breaking machine encounters a mysterious code it cannot crack, head cryptographer Susan Fletcher is brought in to solve the crisis. She uncovers a dangerous secret plot that threatens global intelligence systems and national security. As betrayal spreads within the agency, she races against time to expose the truth. The techno-thriller explores privacy, government surveillance, and the ethics of advanced cryptography.

by Dan Brown

Thomas Dunne Books / St. Martin's Griffin · First published 1998 · 372 pages