620
6 Reverse Engineering of Microcircuits
Fig. 6.92 An example of the application of circuitry-based method to counteract reverse engineering: standard circuit consisting of the logic elements—inverter, NAND gate, NOR gate (a);
modified circuit with applied protection from reverse engineering. Output signal level depends only
on the level of the signal at the X input and doesn’t depend on the level of the signal at the Y input.
The gate functions as an inverter (b) [27]
6 Reverse Engineering of Microcircuits
Fig. 6.92 An example of the application of circuitry-based method to counteract reverse engineering: standard circuit consisting of the logic elements—inverter, NAND gate, NOR gate (a);
modified circuit with applied protection from reverse engineering. Output signal level depends only
on the level of the signal at the X input and doesn’t depend on the level of the signal at the Y input.
The gate functions as an inverter (b) [27]