PIN Block

What it calculates

Builds or reverses a plaintext Format 0 PIN block by XORing PIN and PAN fields.

Inputs and methods

4-12 decimal PIN digits, 12-19 PAN digits, and F padding. Reverse accepts an 8-byte HEX block.

Worked example

PIN 1234, PAN 4012345678909, padding F.

PIN block: 041274EDCBA9876F
Reverse result: 1234

Specification and limits

Custom padding is non-standard. This tool does not decrypt encrypted blocks or verify a cardholder PIN.