📖 Description
1. What is PBKDF2?
PBKDF2 is a classic key derivation function designed to exponentially increase the cost for attackers:
- Controllable Computational Cost: By performing thousands of iterative hash operations, the time required for a single password attempt is extended. For legitimate users, these few hundred milliseconds are imperceptible; but for attackers attempting billions of times per second, this is a fatal obstacle.
- Resists Rainbow Tables: Mandates the use of a "Salt", ensuring that even if two users use the same password, the derived keys generated are completely different.
- Compliance Ready: It is an algorithm recommended by NIST (National Institute of Standards and Technology) and widely used in Wi-Fi security (WPA2), disk encryption, and database password storage.
2. Core Feature Analysis
This site's tool provides highly flexible configuration options to meet various security architecture needs:
A. Algorithm Matrix (Pseudo-Random Function PRF)
Supports multiple underlying hash functions as the derivation base:
- HMAC-SHA1: Classic compatibility mode (commonly used in legacy systems).
- HMAC-SHA256: The current mainstream recommended standard, balancing security and efficiency.
- HMAC-SHA512: Provides the highest level of collision resistance and security.
B. Customizable Iteration Count (Iterations)
- Supports custom settings from 1 to 1,000,000 iterations.
- Security Recommendation: Based on current hardware capabilities, it is recommended to set no less than 10,000 iterations (NIST recommends higher values to counter GPU-accelerated cracking).
C. Dynamic Salt Management (Salting)
- Supports inputting salt in text or hexadecimal (Hex) format.
- Salt effectively prevents attackers from using pre-computed "rainbow tables" for large-scale cracking.
D. Export Length Customization (Key Length)
- You can specify the length of the generated derived key (e.g., 32 bytes corresponds to a 256-bit key), meeting the requirements of different symmetric encryption algorithms like AES-128, AES-256.
E. Privacy Protection (Local Computation)
- Zero Leakage Risk: All derivation operations are performed locally in your browser.
- Local Processing: Your original password, salt, and generated key are never uploaded to the server. The security is equivalent to running Python or OpenSSL scripts locally offline.
3. Operation Process Overview
- Input Password: Enter the text you need to convert in the "Original Password" field.
- Set Salt: Enter random characters as the salt. Remember: Different salts produce completely different results.
- Configure Parameters:
- Select a hash algorithm (e.g., SHA256).
- Enter the iteration count (e.g., 10000).
- Set the target length (e.g., 32 bytes).
- Instant Generation: Click "Start Derivation", and the derived key in Hex format will be displayed in real-time below.
- One-Click Copy: Copy the generated key for use in your program code or encryption configuration files.
4. Why Choose This Site's PBKDF2 Assistant?
- Standard Compliant: Calculation results are completely consistent with OpenSSL, Java JCE, and Node.js's
crypto.pbkdf2.
- Debugging Friendly: Provides real-time feedback, making it easy for developers to compare key differences under various parameters. It's an ideal tool for testing backend hardening logic.
- Completely Free: No registration required, unlimited usage, accelerating your project's security.
- Clean Interface: Focuses on core functionality, free from ad interference.