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PIN from PIN Block

Extract the clear PIN from an ISO 9564 Format 0 or Format 1 PIN block — optionally decrypt an encrypted PIN block using a PEK/ZPK first

🛡️ Authorized QA & Sandbox Testing Only: This ISO 9564 diagnostic tool is designed strictly for payment switch engineers verifying PIN block formatting and ZPK/PEK translation in non-production test environments. Never enter live production keys or cardholder PIN blocks.
🔓 PIN Block Data

16 hex characters (8 bytes). Clear or encrypted PIN block.

13–19 digit card number. Required for Format 0, ignored for Format 1. Spaces allowed.

🔑 PIN Encryption Key (Optional)

Optional. 16-byte double-length 3DES key (32 hex chars). If provided, the PIN block is first decrypted via 3DES-ECB.

How it works: This tool reverses the PIN block encoding process to recover the original PIN.

Format 0 (ISO 9564-0 / ANSI X9.8): The clear PIN block is XORed with a PAN field (0000 + rightmost 12 PAN digits excl. check digit) to recover the PIN field. The PIN is then read from nibbles 2 through 2+N.

Format 1 (ECI-4): The PIN digits are stored directly in the clear block (nibbles 2 through 2+N), with random fill padding. No PAN is needed.

Encrypted blocks: If a PEK (PIN Encryption Key) or ZPK (Zone PIN Key) is provided, the tool first decrypts the block using 3DES-ECB before extraction.

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PIN Block Format 0

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PIN Block Format 1

Calculate ISO 9564-1 Format 1 PIN blocks (no PAN required)
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📖 About This Tool

What is the PIN from PIN Block Extractor?

The PIN from PIN Block Extractor recovers the clear PIN from a clear-text or decrypted PIN block. It supports ISO 9564 Format 0 (requiring PAN) and Format 1 (PAN-independent) PIN blocks.

🛠️ How to Use
  1. Enter the clear or encrypted PIN block (16 hex characters).
  2. For Format 0 PIN blocks, enter the PAN (13–19 digits).
  3. Optionally enter the 32-hex PEK/ZPK if the PIN block is 3DES-encrypted.
  4. Click Extract PIN to auto-detect the format and recover the clear PIN.
❓ FAQ

Can I extract a PIN from an encrypted PIN block?

Yes. Provide your 16-byte double-length 3DES PEK/ZPK (32 hex characters) in the optional PIN Encryption Key field, and the tool will decrypt the PIN block via 3DES-ECB before extracting the clear PIN.