Argon2 Hash Generator & Verifier

What is Argon2?

Argon2 is the winner of the Password Hashing Competition (PHC) and is currently considered the state-of-the-art algorithm for password hashing. Unlike older algorithms, Argon2 is designed to be memory-hard, providing superior protection against brute-force attacks using specialized hardware like GPUs or ASICs.

Argon2 Variants

1. Argon2id (Recommended): A hybrid version that combines the strengths of Argon2i and Argon2d. It is effective against both side-channel attacks and GPU-based attacks.
2. Argon2i: Designed to be resistant to side-channel attacks (timing attacks). Best for cases where the attacker might have access to the server's local environment.
3. Argon2d: Designed for maximum resistance against GPU cracking attacks. Great for cryptocurrencies or environments where side-channel attacks are not a primary concern.

How to Use This Tool

Generate a Hash

1. Enter Password: Provide the password you want to hash.
2. Select Type: Choose between Argon2id (default), Argon2i, or Argon2d.
3. Configure Costs:
   • Iterations (Time Cost): How many times the algorithm runs.
   • Memory Cost: How much RAM is required to compute the hash. Higher values make GPU attacks much harder.
   • Parallelism (Threads): Number of parallel computing threads.
4. Click Generate: The tool will generate an Encoded Hash string containing all parameters and the salt.

Verify a Password

1. Go to Verifier Tab: Switch to the verify mode.
2. Enter Password: The plaintext password you want to test.
3. Paste Encoded Hash: Paste the specialized Argon2 string (e.g., $argon2id$v=19$m=65536,t=3,p=4$...).
4. Verify: The tool will automatically parse the parameters and tell you if they match.

Why Argon2 is Better for Passwords?

While Bcrypt is excellent, Argon2 takes protection a step further:

• Memory Hardness: It requires a significant amount of RAM to perform a single hash, making it extremely expensive for attackers to build custom hardware to crack it.
• Customizability: You can fine-tune it specifically for your server's hardware capabilities.
• Modern Standard: It represents the current best practice for securing user credentials in modern applications.

Security & Privacy

This tool runs entirely in your web browser using WebAssembly (WASM). No data is sent to our servers. Your password never leaves your device, ensuring maximum privacy and security.

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Frequently Asked Questions

What are the ideal parameters for Argon2?

The OWASP recommendation for Argon2id is a memory cost of at least 64 MB, a time cost of 3 iterations, and a parallelism of 4 threads. However, you should adjust these based on your specific server's performance.

What is the "Encoded Hash" format?

The string looks something like this: $argon2id$v=19$m=65536,t=3,p=4$salt$hash. It is a self-contained format that tells the verifier exactly which parameters and which random salt were used to create the hash, allowing for easy verification.

Can I use these hashes in my Backend?

Yes! Most modern languages (Python, Go, Node.js, PHP, Ruby) have libraries that support this standard Argon2 encoded format.

Does Argon2 slow down my application?

By design, yes. It should take around 100-500ms to compute. This "slowness" is what protects you from attackers who would otherwise try millions of passwords per second.