Digital Fortress by Dan Brown

Digital Fortress?is a?techno-thriller?novel written by American author?Dan Brown?and published in 1998 by?St. Martin's Press. 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 of using such technology....MORE
When the United States?National Security Agency's code-breaking?supercomputer?TRANSLTR encounters a revolutionary new code,?Digital Fortress,?that it cannot break, Commander Trevor Strathmore calls in head cryptographer Susan Fletcher to crack it. She is informed by Strathmore that it was written by Ensei Tankado, a former NSA employee who became displeased with the NSA's intrusion into people's private lives. If the NSA doesn't reveal TRANSLTR to the public, Tankado intends to auction the code's algorithm on his website and have his partner, "North Dakota", release it for free if he dies, essentially holding the NSA hostage. Strathmore tells Susan that Tankado has in fact died in?Seville, of what appears to be a heart attack. Strathmore intends to keep the death a secret because if Tankado's partner finds out, he will upload the code. The agency is determined to stop Digital Fortress from becoming a threat to national security. Strathmore asks Susan's fianc? David Becker to travel to Seville and recover a ring that Tankado was wearing when he died. The ring is suspected to have the code that unlocks Digital Fortress. However, Becker soon discovers that Tankado gave the ring away just before his death. Each person he questions in the search for the ring is murdered by Hulohot, a mysterious deaf assassin.
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