My testing program cannot handle such encryption. i searched on Google and found that CueCat's encryption can be stopped with a simple hardware modification.
The steps here are exactly for Cat. No. 68-1966, they may vary for others.
- Open the CueCat case.
- Find the SMT IC K130A033 HMS91C7316, remove the connection between pin 5 and the board.
- Reassemble the CueCat.