Introduction
Web security is about protecting data and users: confidentiality, integrity, and availability. We’ll stick to foundational practices that apply to most web apps—no attack deep dives. A few habits (HTTPS everywhere, hashed passwords, parameterized queries, secrets out of code) wipe out most common risks. Here’s the checklist; we’ll point you where to go deeper.
What Is Web Security Basics
Web security includes how you handle authentication (who the user is), authorization (what they’re allowed to do), transport (HTTPS), input validation, and safe handling of secrets. The goal is to prevent unauthorized access, tampering, and data loss. You rely on standards (TLS, secure cookies, CSP) and careful implementation.
Why It Matters
A single misconfiguration or bug can expose user data or account takeover. Understanding basics (HTTPS everywhere, hashed passwords, parameterized queries, no secrets in frontend) reduces risk and helps you respond to incidents.
How to Calculate It
Real-Life Example
Login: user submits email and password over HTTPS. Server looks up the user, compares the submitted password with the stored hash using a constant-time function. On success, issue a signed session cookie (HttpOnly, Secure, SameSite). The frontend never sees the password or the hash; it just sends the cookie on subsequent requests.
Common Mistakes
Storing passwords in plain text or with a weak hash. Sending secrets in URLs or in the frontend. Not using HTTPS. Trusting client input without validation. Exposing stack traces or internal errors to users. Using default or weak secrets in production.
Practical Tips
- Use HTTPS everywhere; set HSTS and secure cookies.
- Hash passwords with bcrypt or Argon2; never store or log plain passwords.
- Use parameterized queries or an ORM; validate and escape input.
- Keep dependencies updated; run vulnerability scans.
- Store API keys and DB credentials in environment variables or a secret manager.
FAQs
Conclusion
Web security rests on HTTPS, strong password handling, safe input handling, and keeping secrets out of code and the client. Apply these basics consistently and keep learning from official resources. Start with HTTPS, hashed passwords, parameterized queries, and secrets in env vars; then add auth, CORS, and input validation as your app grows.