Security-First Application Design: User Authentication, Encryption, and Safe Coding Practices

Every application you build carries a hidden responsibility: the safety of the people who trust it with their data. Security-First Application Design is a practical, developer-focused guide that transforms security from an intimidating afterthought into a natural part of how you code. Written for programmers at every level, this book bridges the gap between "knowing how to build software" and "knowing how to build it safely." Inside, you will learn how attackers actually think, how to spot the vulnerabilities that cause real-world breaches, and how to close them before they ever reach production. Using clear explanations and realistic before-and-after code examples, this guide walks you through: Core Security Foundations Understand the CIA Triad, defense in depth, threat modeling, and the STRIDE framework so you can anticipate risks before writing a single line of code. Authentication and Access Control Master password security, credential storage, multi-factor authentication, session management, and modern token systems including OAuth 2.0 and OpenID Connect. Data Protection and Cryptography Learn the real difference between hashing, encryption, and encoding, and how to protect sensitive data both in transit and at rest without needing a mathematics degree. Secure Coding in Practice Prevent injection attacks, broken access control, cross-site scripting, and other issues from the OWASP Top 10 through hands-on, language-agnostic code examples. API Security and Architecture Secure the endpoints that power modern mobile apps and services, manage third-party dependencies safely, and design systems that assume failure will happen. Testing, Deployment, and Ongoing Defense Build automated security testing into your workflow, harden cloud deployments, and create a lasting…