This is quite similar to the early decryption of the analog Nagravision TV encryption system https://en.wikipedia.org/wiki/Nagravision https://en.wikipedia.org/

This is quite similar to the early decryption of the analog Nagravision TV encryption system https://en.wikipedia.org/wiki/Nagravision https://en.wikipedia.org/wiki/Nagravision worked. Did it myself at the time, but on to slow hardware/to little optimized software. The decryption took much to long to be usable, but it was fun to see that it worked quite fine