Apparatus for protecting against external attack for processor based on arm core and method using the same

An apparatus for protecting against external attacks for a processor based on an ARM core, comprising:

• a JTAG interface configured to be connected with the processor based on the ARM core for JTAG communication;
• a register configured to be set up by a reset handler which is executed at first within a boot image;
• a control signal generator configured to generate a control signal for protecting against external attacks to selectively control blocking or connection of the JTAG interface when an external debug request signal or an output signal of the register is activated;
• and
• a blocking unit configured to block the JTAG interface based on the control signal for protecting against external attacks,
• wherein the register is configured to be set up before connection setting of the JTAG communication.