Books

Free

• Security Engineering by Ross Anderson

Cryptology

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• Cryptography Engineering

Application Security

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• Threat Modeling: Designing for Security
• The Tangled Web: A Guide to Securing Modern Web Applications
• The Web Application Hacker’s Handbook: Finding and Exploiting Security Flaws 2nd Edition by Dafydd Stuttard and Marcus Pinto

Mobile Security

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• The Mobile Application Hacker’s Handbook
• Android Security Internals: An In-Depth Guide to Android’s Security Architecture
• Android Hacker’s Handbook
• iOS Hacker’s Handbook
• iOS Application Security: The Definitive Guide for Hackers and Developers