Secure Password Storage Practices for Modern Apps

Why Password Storage Matters

Passwords are a primary target for attackers. If a password database is compromised, poorly stored passwords can be exposed immediately. The safest approach is never to store plaintext passwords, and instead store encrypted hashes with a unique salt for each user.

Hashing vs Encryption

Hashing is a one-way function: you can transform a password into a fixed-size digest, but you cannot reverse it back to the original password. Encryption is reversible if you have the key, so it is not suited for password storage.

const hashedPassword = await bcrypt.hash(password, 12)

Use a proven algorithm like bcrypt, Argon2, or scrypt. These algorithms are intentionally slow and resistant to brute force attacks.

Why Salting Is Essential

A salt is a random string added to the password before hashing. It ensures that identical passwords produce different hashes, preventing attackers from using precomputed tables or identifying users with the same password.

Secure Login Flow

1. User submits password.
2. Server fetches the stored salt and hashed password.
3. Server hashes the provided password with the same salt.
4. Server compares the new hash to the stored hash.

Practical Tips

• Use HTTPS for all authentication traffic.
• Implement rate limiting and account lockouts.
• Rotate keys and salts carefully.
• Use a separate, secure secrets management system for keys.

Conclusion

Storing passwords securely is one of the most important tasks for any web application. Hash every password, use a unique salt, choose a strong algorithm, and never store plaintext passwords. These steps protect your users and reduce the risk of a full account compromise.

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