95results about How to "Reduce the Risk of Confidentiality" patented technology

The invention relates to a safety JTAG circuit and a method for protecting the security of information inside a chip. The safety JTAG circuit connected between a JTAG port and a protected object comprises a nonvolatile medium, a loading circuit, a security attribute control register, a TAP controller, a first selector, a second selector, a switch, a password authentication circuit and a logic processing circuit. The TAP controller and the two selectors are connected between the JTAG port and the protected object. The switch is switched by the control of a timer. The password authentication circuit is used for authenticating whether a clear-text password input by a user is accordant with a fuzzification password or not. The logic processing circuit is used for logically processing an authentication result output by the password authentication circuit and an indication signal output by the security attribute control register and outputting an enable signal to the two selectors so as to control whether the JTAG port is allowed to be connected with the protected object inside the chip through the TAP controller or not. The invention ensures the security and the convenience of an SOC chip in testing and debugging processes, thereby protecting the security of data inside the chip.