What Is Argon2?

Argon2 is a password-hashing function that encapsulates state of the art in memory-hard function design. It can be used to hash passwords for credential storage, key derivation, and other purposes.

It has a straightforward design that aims for the highest memory fill rate and efficient utilization of numerous compute units while defending against tradeoff attacks (exploiting the recent processors' cache and memory organization).

Generate Argon2 Passwords

1. Enter your Plain Text
2. Select the Parallelism Factor, Memory Cost, Iterations, Hash Length
3. Select the Hash Type
4. Choose the Hash Format for the output string 
5. Click 'Generate Hash' to compute the hash string

Verfiy Argon2 Passwords

1. Enter the Hashed Argon text
2. Enter the Plain text to be compared
3. Click 'Compare Hash' to validate both strings

Argon2 Security?

Argon2 is divided into three types: Argon2i, Argon2d, and Argon2id. Argon2d is quicker and employs data-dependent memory access, making it highly resistant to GPU cracking attacks and appropriate for applications where side-channel timing assaults aren't a concern (e.g., cryptocurrencies). Instead, Argon2i employs data-independent memory access, preferable for password hashing and password-based key derivation. Still, it is slower because it makes more memory passes to guard against tradeoff attacks. Argon2id is a mixture of Argon2i and Argon2d that uses a mix of data-dependent, and data-independent memory accesses to provide some of Argon2i's side-channel cache timing resistance and much of Argon2d's GPU cracking resistance.

Argon2 Parameters

Argon2i, Argon2d, and Argon2id are parametrized by:

1. A time cost defines the amount of computation realized and, therefore, the execution time given in a number of iterations.
2. A memory cost, which represents memory usage, is given in kibibytes. A “kibibyte” is equal to 1024, or 2^10, bytes. 
3. A parallelism degree, which defines the number of parallel threads

Popular Hash Algorithms

There are several well-known hash functions in use today:

• Hashed Message Authentication Code (HMAC): Combines authentication via a shared secret with hashing.
• Message Digest 2 (MD2): Byte-oriented, produces a 128-bit hash value from an arbitrary-length message, designed for smart cards.
• MD4: Similar to MD2, designed specifically for fast processing in software.
• MD5: Similar to MD4 but slower because the data is manipulated more. Developed after potential weaknesses were reported in MD4.
• Secure Hash Algorithm (SHA): Modeled after MD4 and proposed by NIST for the Secure Hash Standard (SHS), produces a 160-bit hash value.