sha224(sha224($pass).sha224($pass)) Hash

What is sha224(sha224($pass).sha224($pass))?

The cryptographic hash format `sha224(sha224($pass).sha224($pass))` is a nested SHA-224 composition scheme derived from the broader SHA-2 family of cryptographic hash functions, standardized in FIPS PUB 180-4. This construction involves two sequential SHA-224 hashing operations: the input string is first hashed as `sha224($pass)`, then concatenated with itself (`sha224($pass).sha224($pass)`), and finally hashed again with SHA-224. While not an officially sanctioned variant, this technique was historically employed to artificially increase output size (from 224 bits to 448 bits) or to obfuscate plaintext inputs in legacy systems, particularly in password storage mechanisms where longer hashes were mistakenly assumed to confer greater security. Its primary use-case was in password hashing schemes where developers sought to mitigate rainbow table attacks by expanding the hash length, though this approach lacks formal cryptographic justification and deviates from established best practices like PBKDF2 or bcrypt.

This construction is fundamentally vulnerable to cracking due to its inherent structural flaws and computational inefficiencies. The absence of a cryptographic salt renders it susceptible to precomputed attacks, as identical inputs produce identical outputs, enabling offline dictionary attacks. Additionally, the nested SHA-224 operations introduce no meaningful security benefits—SHA-224 remains vulnerable to collision attacks (e.g., via the birthday paradox) and lacks the iterative slowdown mechanisms of modern key derivation functions. Modern hardware acceleration (GPU/ASIC/FPGA) can trivially parallelize the nested hashing, rendering brute-force attacks feasible at scale. The lack of adaptive work factors (e.g., per-iteration delays) means the scheme offers no resistance to optimized cracking tools like Hashcat or John the Ripper, making it obsolete for serious security applications.

Identifying sha224(sha224($pass).sha224($pass)) 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 sha224(sha224($pass).sha224($pass)), security researchers analyze the hash against a strict regular expression (regex) signature (shown above) to find structural matches.

How to Crack sha224(sha224($pass).sha224($pass))

If you need to recover the plaintext password for a sha224(sha224($pass).sha224($pass)) 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.