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BackWhat Is Argon2 in Cybersecurity?
Argon2 is a memory-hard password-hashing and key-derivation algorithm designed for secure password storage and cryptographic key derivation.
Argon2 won the Password Hashing Competition in 2015 and is widely recommended for modern password hashing and credential protection. Unlike general-purpose cryptographic hash functions optimized for speed, it is intentionally designed to require significant memory and computational resources, making password cracking more difficult for attackers using GPUs, ASICs, or parallel hardware.
How Argon2 Works
Traditional cryptographic hash functions such as SHA-256 are not designed specifically for password storage and can be vulnerable to high-speed password cracking when used improperly.
Argon2 uses memory-hard processing, which means the hashing operation requires configurable memory allocation and computational effort during execution. This increases the cost and complexity of large-scale password cracking attacks.
Administrators can tune Argon2 using several configurable parameters:
Controls how much memory the algorithm uses during hashing.
Determines how many computational iterations the hashing process performs.
Defines how many parallel processing lanes or threads are used during execution.
Understanding the Different Variants
Argon2 includes multiple variants designed for different security and operational requirements.
Uses data-dependent memory access and offers stronger resistance against GPU-based cracking attacks, but may be less suitable where side-channel attacks are a concern.
Uses data-independent memory access to help reduce exposure to certain side-channel timing attacks.
Combines characteristics of Argon2d and Argon2i and is widely recommended for password hashing and secure credential storage.
Argon2 vs. Bcrypt, Scrypt, and SHA-256
Organizations often compare Argon2 with other password-hashing and cryptographic algorithms when selecting authentication and credential-storage methods.
| Hashing Algorithm | GPU/ASIC Resistance | Security Characteristics | Common Use Case |
| Argon2 | Strong resistance when properly configured | Memory-hard password hashing | Password storage and key derivation |
| Scrypt | Memory-hard password hashing | Resource-intensive password protection | Password hashing and key derivation |
| Bcrypt | Adaptive password hashing | Widely used password hashing algorithm | Web and enterprise password storage |
| SHA-256 | Not designed for password hashing alone | General-purpose cryptographic hashing | Integrity verification and cryptographic operations |
Why Argon2 Is Important for Password Security
Argon2 helps organizations strengthen password security by increasing the computational and memory cost required for password cracking attacks.
Security teams often use Argon2 to support password storage, authentication systems, credential protection, and secure key derivation workflows.
However, strong password hashing alone does not eliminate authentication risk. Organizations should also use multi-factor authentication (MFA), secure credential management, monitoring, rate limiting, and strong password policies.
How Hexnode Supports Enterprise Security
Hexnode UEM supports device compliance policies, app management, restrictions, and supported Conditional Access integrations across managed devices. Organizations can use Hexnode to manage applications, enforce compliance policies, apply endpoint restrictions, and support broader endpoint management strategies.
FAQs
Bcrypt remains widely used for password hashing, but Argon2 provides additional configurable controls for memory usage, processing cost, and parallelism.
Properly configured password hashing should balance usability and security by increasing computational cost for attackers while remaining practical for legitimate authentication workflows.
It is designed as a one-way password-hashing function, meaning the original password is not intended to be directly recovered from the stored hash. However, attackers may still attempt brute-force or password-guessing attacks against weak passwords.