After this lesson, you will be able to: Explain why applications are a top attack target and where security fits in the software development lifecycle.
Web applications are the front door for most companies, and a goldmine for attackers. Application Security is the practice of building, testing, and operating software so an attacker can't trick it into doing the wrong thing.
Apps handle the data attackers want (credentials, payments, PII), they're internet-facing by design, and they're written by humans under deadline pressure. The Verizon DBIR consistently lists web app attacks as the #1 breach pattern. Even strong network security can't compensate for an SQL-injectable login page.
Threat modeling at design time, what could go wrong? Secure coding guidelines during development. SAST (static analysis) and SCA (dependency scanning) on every commit. DAST scans against staging deployments. Pen tests before major releases. Bug bounty + monitoring in production. AppSec is woven through every step, not bolted on at the end.
The Open Worldwide Application Security Project (OWASP) is a free non-profit that publishes the most-referenced AppSec resources: the Top 10, the Web Security Testing Guide, the ASVS standard. Every AppSec engineer should bookmark owasp.org.
Choose the SDLC stage.
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