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updatedAt: 2026-05-06T08:16:22.000Z
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# AES DUKPT KSN

![](https://files.readme.io/8bccffe847290618781325b10d56973ce3671cfe3e673d4da3fd8d04c26c6fb0-image.png)

Initial KSN example for WPAY Pin pad using BDK Index/Customer Identifier 01, Vendor/Group Identifier 00. And counter of 1.

\----------------------KEY SET ID----------------- -------TRMS ID------ --Transaction Counter---\
\------24 bit----- ----8 bit------ ----8 bit---- -------24 bit------- -----32 bit-------------\
Issuer ID Number BDK IDX/Cust ID Vendor/Grp ID\
628000 01 00 000001 00000001

AES KSN (96 bit)\
628000010000000100000001