Hackers have uncovered the dark side of cryptography—that device developed to defeat Trojan horses, viruses, password theft, and other cyber-crime. It’s called cryptovirology, the art of turning the very methods designed to protect your data into a means of subverting it.

Malicious Cryptography: Exposing Cryptovirology
Adam Young, Moti Yung
ISBN: 0-7645-4975-8

• Understand the mechanics of computationally secure information stealing
• Learn how non-zero sum Game Theory is used to develop survivable malware
• Discover how hackers use public key cryptography to mount extortion attacks
• Recognize and combat the danger of kleptographic attacks on smart-card devices
• Build a strong arsenal against a cryptovirology attack

Preface by security expert Bruce Schneier (Pratical Cryptography a reference)