iTunes backup < 10.0 Hash

What is iTunes backup < 10.0?

The **iTunes backup hash format pre-10.0** refers to a proprietary cryptographic scheme employed by Apple’s iTunes software (prior to version 10.0) to encrypt user-generated backups of iOS device data. This system utilized a **custom hybrid encryption workflow** combining **AES-128 in CBC mode** with a **SHA-1-based key derivation function (KDF)** to secure backup files. The process began with a user-provided passphrase, which was hashed via SHA-1 and iterated a fixed number of times (typically 1,000 iterations) to generate a **salted intermediate key**. This key was then further processed to derive the **AES encryption key** and **IV (initialization vector)**, ensuring per-backup uniqueness. The primary use-case was to protect sensitive data (e.g., contacts, SMS, app data) stored in `.itunes` backups, though the format lacked formal cryptographic standardization, relying instead on Apple’s proprietary implementation details.

The vulnerability of this scheme stems from **several fundamental design flaws**. First, the **lack of a robust salt iteration mechanism**—while SHA-1 was used, the fixed iteration count (1,000) was trivial for brute-force attacks, especially when combined with **GPU-accelerated rainbow tables** targeting SHA-1 hashes. Second, the **reliance on SHA-1** rendered the KDF susceptible to **collision attacks** and **precomputed hashcat dictionaries**, as SHA-1’s 160-bit output space was insufficient for modern computational power. Third, the **AES-CBC mode** lacked **authentication**, making it vulnerable to **padding oracle attacks** if an attacker could induce decryption errors. Finally, the **absence of key stretching proportional to entropy** (e.g., no adaptive iteration count based on passphrase strength) allowed attackers to exploit **GPU/ASIC hardware** (e.g., NVIDIA CUDA, FPGA clusters) to crack hashes at **rates exceeding 100,000 hashes per second**, rendering the scheme effectively broken by 2013. These weaknesses were later addressed in iTunes 10.0+ via **stronger KDFs (e.g., PBKDF2 with 10,000+ iterations)** and **AES-GCM for authenticated encryption**.

Identifying iTunes backup < 10.0 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 iTunes backup < 10.0, security researchers analyze the hash against a strict regular expression (regex) signature (shown above) to find structural matches.

How to Crack iTunes backup < 10.0

If you need to recover the plaintext password for a iTunes backup < 10.0 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.