sha224(sha224($pass)) Hash

What is sha224(sha224($pass))?

The cryptographic hash format `sha224(sha224($pass))` represents a nested application of the SHA-224 algorithm, a member of the SHA-2 family standardized by NIST (FIPS 180-4) as part of the broader SHA-2 cryptographic hash function suite. SHA-224 was designed to produce a 224-bit (28-byte) hash value, derived from the original SHA-256 by truncating the output to the first 28 bytes while retaining the same internal compression function and message schedule. This double-hashing construct—where the input `$pass` is first hashed with SHA-224, and the resulting hash is then hashed again with SHA-224—was historically employed in systems where additional computational overhead was acceptable to mitigate weaknesses in the base algorithm, such as reduced collision resistance compared to its longer counterparts (e.g., SHA-512). While not explicitly standardized, such nested hashing was occasionally used in legacy systems to artificially increase security margins, though its efficacy was largely theoretical, as the underlying cryptographic strength remained tied to the weaker SHA-224 primitive. Primary use-cases included password storage in environments where SHA-1 was deemed insufficient but SHA-512 was deemed overkill, though modern best practices have since rendered this approach obsolete due to its inefficiency and inherent vulnerabilities.

The `sha224(sha224($pass))` format is vulnerable to cracking primarily due to its reliance on the inherently weak SHA-224 algorithm, which suffers from diminished collision resistance and reduced avalanche effects compared to stronger SHA-2 variants. The nested structure, while adding computational overhead, does not meaningfully improve security because the second hashing operation operates on a truncated 224-bit intermediate, leaving the hash susceptible to brute-force attacks and precomputed rainbow table attacks. Modern GPUs and FPGA-based hardware accelerators can evaluate SHA-224 at rates exceeding 100–1000 hashes per second per core, enabling efficient offline cracking of poorly salted or unsalted hashes. Additionally, the lack of a cryptographic salt in this scheme exacerbates risks, as identical passwords produce identical hashes, allowing attackers to leverage precomputed tables or dictionary attacks. The algorithm’s susceptibility to length-extension attacks (though mitigated by fixed-length inputs) and its inability to resist differential cryptanalysis further undermine its viability, rendering it unsuitable for modern security applications.

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

How to Crack sha224(sha224($pass))

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