Secure Authentication with Hash & Salt
Implementation of a secure authentication system with modern hashing algorithms for web applications.
- C#
- .NET
- ASP.NET
- Cryptography
- MS SQL
The Challenge
A client operated a web application with an outdated authentication system that stored passwords in plain text. A data leak would have led to the immediate compromise of all user accounts.
The Solution
Complete reimplementation of the authentication system according to current security standards, including migration of existing user accounts.
Architecture Highlights
- PBKDF2/Argon2: Use of proven Key Derivation Functions for future-proof password hashes.
- Unique Salts: Cryptographically secure, random salts for each user.
- Lazy Rehashing: Automatic migration of existing passwords on next login.
The Result
The new authentication system meets current OWASP recommendations. The migration of existing users was seamless thanks to lazy rehashing.