Currently there are two ways to decrypt the IC chip,
one is software-based, non-invasive *** referred to by some software, such as the self-similar device programmer, this method does not destroy the master (decryption chip in a non-encrypted);
there is a mainly implemented in hardware, support software, called *** invasive, this method requires stripped master (called the opening or open end, decapsulation), and then made to modify the circuit (typically He said FIB: focused ion beam), the structure and shape such damage chip line only affects the chip die encryption function, the function does not change the chip itself.
Each specific chip decryption scheme only engineer he is the most clear and simple variety, a man of the chip are encountered. Of course people have the competitive spirit, encounter difficult chip, engineers are more willing to study, discovered a mystery.