A method, system and apparatus of a secure debug interface and memory of a media security circuit and method are disclosed. In one embodiment, a host processor, an external hardware circuit to encrypt an incoming data bit communicated to a debug interface using a debug master key stored at a pointer location of a memory (e.g., the memory may be any one of a flash memory and/or an Electrically Erasable Programmable Read-Only Memory (EEPROM)) and to decrypt an outgoing data bit from the debug interface using the debug master key, and a media security circuit having the debug interface to provide the pointer location of the memory having the debug master key to the external hardware circuit.