A Complete Security Protocol To Safeguard IJTAG Architecture

The IEEE IJTAG (Internal JTAG) or IEEE 1687 standard was introduced to streamline access to the on-chip sensors and instruments. The IEEE 1687 standard has been successfully deployed in several modern SoC designs, and the same IJTAG network is extensively used to deploy the streaming scan networks and other advanced test methodologies. The IJTAG network gives access to most of the security critical components, and its security is very important. Several researchers across academia and industry have proposed security solutions for IJTAG, which do not address all threat models holistically. In this work, we propose a comprehensive security technique to safeguard the IJTAG from both internal and external threat models. The proposed technique employs an encryption-based solution to protect the architecture against malicious external attackers and untrustworthy third-party test centers and IP core vendors. We compare the proposed solution with existing solutions as well as present the test time overhead and attack analysis.