FAQs
In essence, the steps to do this check are:
- Extract the salt and parameters from the encoded password hash stored in the database.
- Derive the hash of the plaintext password using the exact same Argon2 variant, version, salt and parameters.
- Check whether this new hash is the same as the original one.
Argon2 is a secure password hashing algorithm. It is designed to have both a configurable runtime as well as memory consumption. This means that you can decide how long it takes to hash a password and how much memory is required. In September 2021, Argon2 has been standardized by the IETF in RFC 9106.
How do you choose the right parameter for Argon2? ›
Choosing Parameters
- Choose whether you want Argon2i, Argon2d, or Argon2id ( type ). ...
- Figure out how many threads can be used on each call to Argon2 ( parallelism , called “lanes” in the RFC). ...
- Figure out how much memory each call can afford ( memory_cost ). ...
- Select the salt length.
Argon2 is a great memory-hard password hashing algorithm, which makes it good for offline key derivation. But it requires more time, which, for web applications is less ideal. bcrypt can deliver hashing times under 1 second long, but does not include parameters like threads, CPU, or memory hardness.
How do you validate a hash? ›
How do I validate a hash value? It is important that the tool you use to validate a digital hash is from an independent, and preferably, open source. You will use the tool to convert the file into a hash value which you can then manually compare with the hash value from a trusted source.
Can we decode a bcrypt password? ›
How to decrypt an encrypted password in Mendix app set to bcrypt? You cannot do this because: Passwords are hashed, not encrypted. Hashing is one way only, you cannot reverse it.
What is Argon2 password hash? ›
What Is Argon2? Argon2 is a password-based key derivation function. It's a secure password hashing function designed to have many parameters that can be adjusted.
What is the Argon2 password hashing algorithm? ›
Argon2 is a secure password hashing algorithm. It is designed to have both a configurable runtime as well as memory consumption. This means that you can decide how long it takes to hash a password and how much memory is required. In September 2021, Argon2 has been standardized by the IETF in RFC 9106.
What is the max length of Argon2 hash? ›
argon2-length
| Synopsis | The length of the produced hash. |
|---|
| Default value | 32 |
| Allowed values | An integer. Lower limit: 4. Upper limit: 32768. |
| Multi-valued | No |
| Required | No |
4 more rowsDec 14, 2023
Argon2 is a cryptographic hashing algorithm specifically used to hash passwords. It provides better protection against password cracking than other hashing algorithms like Bcrypt, Scrypt, and PBKDF2. The Argon2 function takes in the password and outputs the hash of the specified length.
Normally you'd use a KBKDF such as HKDF instead of a PBKDF such as Argon2 (but preferably not just a hash). If you have 256 bits worth of keying material. However, if it is stored as a password I can imagine the requirement. The salt is technically not required, but neither is Argon2, so yeah...
Is Argon2 better than PBKDF2? ›
In short, argon2 is better. Do beware that iOS auto-fill still seems to cause some issues, so if you use iOS, lower your “memory” setting to 48 MiB. More technical explanation: Argon2 was specifically crafted to fix the inherent flaws of compute bounded key derivation functions like pbkdf2.
What is Argon2 hash code? ›
What Is Argon2? Argon2 is a password-based key derivation function. It's a secure password hashing function designed to have many parameters that can be adjusted.
What is Argon2 hash format? ›
Argon2 is a cryptographic hashing algorithm specifically used to hash passwords. It provides better protection against password cracking than other hashing algorithms like Bcrypt, Scrypt, and PBKDF2. The Argon2 function takes in the password and outputs the hash of the specified length.
Is Argon2 a hash function? ›
Argon2 is a secure password hashing algorithm. It is designed to have both a configurable runtime as well as memory consumption. This means that you can decide how long it takes to hash a password and how much memory is required. In September 2021, Argon2 has been standardized by the IETF in RFC 9106.
