GM 2 Byte Key Calculator

Enter a Global A security seed and algorithm byte to reproduce the 2 byte key the module expects. You can also list every key for a seed, or work backwards from a response to see which tables and algorithms make it.

Seed and algorithm

Enter the captured seed, choose the table, and set the algorithm byte to reproduce the 2 byte response.

Security table

Run the calculator to see the 2 byte response and the details you entered.

List every key

Work through every algorithm in the chosen table for a seed. Handy when you do not know the algorithm.

Run the list to see every algorithm in the chosen table.

Reverse lookup

Already have the response? Pair it with the same seed and we will list each table and algorithm that makes it.

Submit a lookup to see every table and algorithm that recreates the response.