WPA-PBKDF2-PMKID+EAPOL Hash

What is WPA-PBKDF2-PMKID+EAPOL?

The **WPA-PBKDF2-PMKID+EAPOL** hash format is derived from the broader **Wi-Fi Protected Access (WPA)** and **WPA2-Personal** authentication frameworks, specifically tailored for offline cracking of **EAPOL-Key Handshake** captures in environments leveraging **Pre-Shared Key (PSK) authentication with PMKID extensions**. This format encapsulates the **Password-Based Key Derivation Function 2 (PBKDF2)** with a SHA-256 hash iteration count (typically 4096–20480 iterations), where the input consists of a concatenated string of the **SSID (broadcast name) and the user-supplied passphrase**, followed by a **salted iteration of the PMK (Pairwise Master Key)** derived via the **EAPOL-Key Handshake** protocol. The resulting hash is structured as a **hexadecimal digest** (e.g., `PMKID:SSID:passphrase:PMK`) and is used primarily in offline brute-force attacks against WPA/WPA2 handshakes captured via tools like **Hashcat** or **John the Ripper**. The inclusion of **PMKID** (a variant of the EAPOL handshake) enables attackers to bypass the need for live deauthentication attacks, as the PMK can be derived directly from the captured handshake data, reducing the attack surface to password guessing alone.

The vulnerability of this format to cracking stems from **suboptimal cryptographic design choices and computational optimizations**. The **fixed iteration count (often too low, e.g., 4096)** in PBKDF2 is susceptible to **GPU/ASIC acceleration**, as modern hardware (e.g., NVIDIA CUDA or AMD ROCm) can parallelize brute-force attempts at high speeds (e.g., **100–1000+ hashes/second per GPU**). Additionally, the **lack of a dynamic salt per iteration** (unlike modern KDFs like Argon2) allows attackers to precompute or optimize attacks via **rainbow tables** or **lookup tables** for weak passphrases. Furthermore, the **SSID’s inclusion as a static prefix** in the hash input reduces entropy, as many networks reuse generic names (e.g., "MyWiFi"), enabling **dictionary attacks** to narrow down candidates efficiently. Finally, the **collision resistance of SHA-256**—while sufficient for integrity—does not mitigate against **timing attacks** or **side-channel exploits** in poorly implemented cracking tools, and the **lack of key stretching beyond PBKDF2** makes it vulnerable to **quantum-resistant optimizations** if post-quantum cryptography is not integrated.

Identifying WPA-PBKDF2-PMKID+EAPOL 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 WPA-PBKDF2-PMKID+EAPOL, security researchers analyze the hash against a strict regular expression (regex) signature (shown above) to find structural matches.

How to Crack WPA-PBKDF2-PMKID+EAPOL

If you need to recover the plaintext password for a WPA-PBKDF2-PMKID+EAPOL 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.