Open Document Format (ODF) 1.2 (SHA-256, AES) Hash

What is Open Document Format (ODF) 1.2 (SHA-256, AES)?

The Open Document Format (ODF) 1.2, as standardized by OASIS, mandates the use of cryptographic primitives for digital signatures and encryption, where SHA-256 serves as the primary hash function for digital signatures and message authentication, while AES (in CBC or ECB mode with 256-bit keys) handles full-document encryption. Originating from the broader ODF 1.0 lineage, the 1.2 specification (2012) formalized cryptographic requirements to ensure interoperability and security in office document exchange, particularly for XML-based files like `.odt` or `.ods`. The format’s structure enforces a hierarchical XML schema where cryptographic metadata (e.g., ``) embeds SHA-256 hashes of plaintext segments, AES-encrypted ciphertext blocks, and XML Digital Signature Syntax (DSig) envelopes signed with RSA or ECC. This design prioritizes integrity verification via hash chaining and confidentiality via AES, though the absence of a standardized key derivation function (KDF) leaves implementation-dependent vulnerabilities exposed.

SHA-256’s vulnerability in ODF 1.2 stems from its susceptibility to brute-force and collision attacks when paired with predictable input patterns, exacerbated by the lack of a salt in hash-based signatures (e.g., ``). Modern GPU-accelerated tools (e.g., CUDA-optimized SHA-256 miners) can achieve hash rates exceeding 100+ GH/s, enabling practical cracking of weak passwords or keys hashed via SHA-256 within hours. Additionally, AES-CBC mode in ODF 1.2 lacks initialization vector (IV) randomization standards, risking PKCS#7 padding oracle attacks if IVs are static or derived predictably. Collision resistance, while theoretically robust for SHA-256, is mitigated by ODF’s reliance on XML-based hashing of entire document segments, amplifying the attack surface for differential cryptanalysis. Furthermore, the absence of post-quantum cryptography or key rotation mechanisms renders the format vulnerable to future quantum computing threats, particularly if RSA/ECC keys remain unprotected by lattice-based hybrids.

Identifying Open Document Format (ODF) 1.2 (SHA-256, AES) 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 Open Document Format (ODF) 1.2 (SHA-256, AES), security researchers analyze the hash against a strict regular expression (regex) signature (shown above) to find structural matches.

How to Crack Open Document Format (ODF) 1.2 (SHA-256, AES)

If you need to recover the plaintext password for a Open Document Format (ODF) 1.2 (SHA-256, AES) 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.