Scrypt Hash Generator Online
Create scrypt hashes instantly in your browser with our real-time hashing tool. Scrypt is a memory-hard key derivation function designed for secure password storage — its high memory and CPU requirements make brute-force and GPU attacks exponentially harder than with fast hashes like MD5 or SHA-256.
Understanding Scrypt Hash Parameters
The strength and performance of the scrypt hashing algorithm depend on several key parameters:
| Parameter | Type | Description | Recommended Value |
|---|---|---|---|
| N (Cost Factor) | Integer (power of 2) | Controls the CPU/memory cost. Higher = slower, more secure. Must be a power of 2. | 16384 (214) |
| r (Block Size) | Integer | Memory cost factor. Increasing this will use more memory. | 8 |
| p (Parallelization) | Integer | Controls how many independent threads can be run in parallel. | 1 |
| Salt | Byte array | A unique random value added to your input for hash uniqueness and security. | Random 16-byte Uint8Array |
| Key Length | Integer | The desired length (in bytes) of the generated hash. | 32 (256 bits) |
Security Tip
Use a secure, random salt for every input. Avoid low N values, as they reduce protection against brute-force attacks. The memory requirement of scrypt is approximately 128 * N * r bytes — with N=16384 and r=8, that is 16 MB per hash computation.
Why Use Scrypt?
Scrypt is a modern, memory-hard key derivation function that makes password cracking exponentially harder. Unlike fast hash functions (MD5, SHA-256), scrypt requires large amounts of RAM — an attacker needs dedicated memory per parallel crack attempt, which drastically limits GPU-based attacks. It is widely adopted in:
- Web application password storage (Node.js, Python, Go standard libraries)
- Litecoin and other cryptocurrencies (proof-of-work)
- Disk encryption key derivation
- High-security application secret management
scrypt vs bcrypt
- Memory hardness: Scrypt is memory-hard; bcrypt is CPU-bound only
- GPU resistance: Scrypt is significantly harder to parallelize on GPUs/ASICs
- Configurability: Scrypt offers more tunable parameters (N, r, p)
- Adoption: Bcrypt has broader framework support (bcrypt is built into many ORMs and auth libraries)
Tool Features
- Real-time scrypt hashing (no page reload needed)
- Adjustable cost parameters for custom security levels
- Output options: Hex, Base64, Raw Bytes
- Works 100% client-side, even offline
Frequently Asked Questions
What is scrypt?
Scrypt is a memory-hard key derivation function (KDF) designed by Colin Percival in 2009. Unlike MD5 or SHA-256 which are fast, scrypt is intentionally slow and requires a large amount of RAM to compute — making it extremely difficult to attack with GPUs, FPGAs, or ASICs. It is used for secure password storage and key derivation.
What do the scrypt parameters N, r, and p mean?
N (cost factor) controls CPU/memory cost — must be a power of 2; higher = more secure but slower. r (block size) sets memory cost; increasing it uses more RAM. p (parallelization factor) controls how many parallel threads run. Recommended defaults: N=16384, r=8, p=1 for interactive logins; N=1048576 for offline key derivation.
scrypt vs bcrypt: which is better for passwords?
Both are secure for password hashing. Scrypt has the advantage of being memory-hard — it requires large amounts of RAM, making parallel GPU attacks much more expensive. Bcrypt is CPU-bound but more widely supported across languages and frameworks. For new projects with no legacy requirements, scrypt (or Argon2) is generally preferred for its stronger resistance to hardware attacks.
Is scrypt safe for production password storage?
Yes. Scrypt is recommended by OWASP and used in production by many security-critical systems. Litecoin, the cryptocurrency, uses scrypt as its proof-of-work algorithm. Ensure you use a cryptographically random salt and appropriate N/r/p parameters for your hardware.
What salt should I use with scrypt?
Always use a cryptographically random salt of at least 16 bytes (128 bits), generated fresh for each password. The salt prevents rainbow table attacks and ensures that two identical passwords produce different hashes. Never reuse salts or use predictable values like usernames.
Online Hashing Tools and Services
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