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Argon2 Hash Generator

Generate secure Argon2 hashes for passwords. Argon2 is the winner of the 2015 Password Hashing Competition.

Understanding Argon2: The Next-Generation Password Hashing Algorithm

Argon2 is the winner of the 2015 Password Hashing Competition and is considered one of the most secure password hashing algorithms available today. It's designed to be resistant to both GPU-based attacks and memory-hard, making it an excellent choice for password hashing.

Key Features of Argon2

Memory-Hard Algorithm

  • Argon2 is designed to be memory-hard, meaning it requires a significant amount of memory to compute.
  • This makes it resistant to hardware-based attacks using GPUs or ASICs.
  • The memory cost parameter allows you to adjust the memory requirements (default: 64MB).

Configurable Parameters

  • Memory Cost: Amount of memory required (in MB)
  • Time Cost: Number of iterations (higher = more secure but slower)
  • Parallelism: Number of parallel threads (affects performance)

Security Benefits

  • Resistant to GPU-based attacks
  • Protection against rainbow table attacks
  • Built-in salt support
  • Adaptive to hardware improvements

Best Practices for Using Argon2

Parameter Selection

  • Choose memory cost based on your server's capabilities (64MB is a good default)
  • Set time cost to 3-4 for most applications
  • Use parallelism based on your CPU cores (4 is a good default)

Salt Management

  • Always use a unique salt for each password
  • Store the salt alongside the hash
  • Use cryptographically secure random values for salts

Storage Guidelines

  • Store the complete hash string including parameters
  • Keep the salt with the hash
  • Use secure storage methods (encrypted databases, etc.)

Argon2 vs Other Password Hashing Algorithms

Argon2 Advantages

  • ✅ Winner of the 2015 Password Hashing Competition
  • ✅ Memory-hard design prevents GPU attacks
  • ✅ Highly configurable parameters
  • ✅ Built-in protection against common attacks

Comparison with Bcrypt

  • ✅ More resistant to hardware-based attacks
  • ✅ Better parameter control
  • ✅ More modern design
  • ✅ Better suited for modern hardware

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