BLAKE2-224 Hash

What is BLAKE2-224?

BLAKE2-224 is a member of the BLAKE2 family of cryptographic hash functions, designed as a successor to the original BLAKE (BLAKE, 2013) to address performance bottlenecks and security concerns in modern cryptographic applications. Introduced by Jean-Philippe Aumasson in 2016, BLAKE2 was engineered as a high-performance, variable-output-length hash function optimized for speed while maintaining strong collision resistance. Its structure is based on a Merkle-Damgård iterated hash framework, but unlike its predecessor, BLAKE2 incorporates a keyed variant (BLAKE2b/2s) and a non-keyed variant (BLAKE2), with BLAKE2-224 specifically producing a 224-bit (28-byte) hash output. The algorithm employs a compression function with 16 constant words, a round structure of 10 rounds (5 pairs of rounds), and a finalization step that incorporates the message length and a personalization string to enhance security against length-extension attacks. Primarily used in cryptographic applications requiring compact yet secure hashes—such as password storage (via PBKDF2 or Argon2), blockchain data integrity checks, and lightweight authentication—BLAKE2-224 strikes a balance between efficiency and security, though its shorter output size limits its suitability for high-security contexts where 256-bit hashes are preferred.

Despite its design strengths, BLAKE2-224 remains vulnerable to cracking due to its relatively short output size (224 bits) and susceptibility to brute-force and collision attacks when deployed in unprotected environments. The absence of a built-in salt or key in its non-keyed variant (BLAKE2) exposes it to rainbow table attacks if used directly for password hashing, necessitating additional mechanisms like iterative hashing or salting. Performance optimizations—such as GPU/FPGA acceleration via CUDA or OpenCL—further exacerbate vulnerability by enabling high-throughput cracking attempts, as seen in attacks on shorter hash functions. Additionally, while BLAKE2’s compression function resists known cryptanalytic weaknesses, its 10-round structure is theoretically weaker than longer variants (e.g., BLAKE2-512), making it more susceptible to future advancements in collision-finding algorithms like those based on the Grothendieck–Sikosek–Tsiounis (GST) method. Finally, its lack of adaptive security (fixed output size) limits flexibility in post-quantum migration, as quantum algorithms could potentially reduce its security margin below 128 bits.

Identifying BLAKE2-224 Hashes

Identifying a hash blindly is often difficult because multiple algorithms can output strings of the exact same length. For example, a standard 32-character hexadecimal string could be MD5, NTLM, MD4, or LM. To definitively identify BLAKE2-224, security researchers analyze the hash against a strict regular expression (regex) signature (shown above) to find structural matches.

How to Crack BLAKE2-224

If you need to recover the plaintext password for a BLAKE2-224 hash during a penetration test or forensics investigation, you must supply the correct module ID to your cracking software. Use the exact commands provided at the top of this page to target the hash successfully.