Bcrypt / Argon2: Comprehensive Report
Overview & History
Bcrypt and Argon2 are two popular cryptographic algorithms used for password hashing. Bcrypt was developed in 1999 by Niels Provos and David Mazières, and it is based on the Blowfish cipher. Argon2, on the other hand, was introduced in 2015 by Alex Biryukov, Daniel Dinu, and Dmitry Khovratovich and won the Password Hashing Competition (PHC) that same year.
Core Concepts & Architecture
Bcrypt
Bcrypt is designed to be computationally expensive, making brute-force attacks more difficult. It incorporates a salt to protect against rainbow table attacks and uses a work factor to determine the complexity of hashing.
Argon2
Argon2 offers three variants: Argon2i (optimized for password hashing), Argon2d (resistant to GPU cracking), and Argon2id (a hybrid of the two). It is designed to be memory-hard, making it difficult for attackers to parallelize attacks efficiently.
Key Features & Capabilities
- Bcrypt: Salted hashes, adjustable work factor, resistant to brute-force attacks.
- Argon2: Memory-hardness, adjustable time and memory cost, flexible design with multiple variants.
Installation & Getting Started
Bcrypt
npm install bcryptArgon2
npm install argon2Usage & Code Examples
Bcrypt Example
const bcrypt = require('bcrypt');
const saltRounds = 10;
const myPlaintextPassword = 's0/\/\P4$$w0rD';
bcrypt.hash(myPlaintextPassword, saltRounds, function(err, hash) {
// Store hash in your password DB.
});Argon2 Example
const argon2 = require('argon2');
async function hashPassword() {
try {
const hash = await argon2.hash('password');
console.log(hash);
} catch (err) {
console.error(err);
}
}
hashPassword();Ecosystem & Community
Bcrypt and Argon2 are both widely supported and have robust communities. They are available in many programming languages and have extensive documentation and community support.
Comparisons
Bcrypt and Argon2 serve similar purposes but differ in their approach to security. Bcrypt is older and more established, while Argon2 is newer and offers more flexibility and stronger security features with its memory-hard design.
Strengths & Weaknesses
Strengths
- Bcrypt: Proven track record, simplicity, and wide adoption.
- Argon2: Superior security features, flexibility, and memory-hard design.
Weaknesses
- Bcrypt: Limited to CPU-bound operations, less flexible than Argon2.
- Argon2: Newer and less tested over time compared to Bcrypt.
Advanced Topics & Tips
When using these algorithms, consider the specific security needs of your application. Adjust work factors or memory and time costs to balance security and performance. Regularly update your libraries to benefit from security patches and improvements.
Future Roadmap & Trends
Argon2 is expected to gain more traction as it is integrated into more systems and libraries. Bcrypt will continue to be used due to its simplicity and established presence. Future trends include improvements in hardware-based security and increased emphasis on memory-hard algorithms.