SHI-Lock: Enabling Co-Obfuscation for Secure Heterogeneous Integration Against RE and Cloning
Md Saad Ul Haque, Rui Guo, M. Sazadur Rahman, Hadi Mardani Kamali, Farimah Farahmandi, Mark Mohammad Tehranipoor · 2023
With the limitations of Moore's Law and Dennard scaling in integrated circuits (ICs) on the horizon, the concept of heterogeneous integration (HI) has gained significant traction as a favored method for creating System-in-Packages (SiP) through the utilization of chiplets. However, this shift brings forth a fresh set of security concerns, wherein the SiPs or their chiplets are vulnerable to a vector of threats, including reverse engineering and unauthorized overproduction. In this paper, we introduce SHI-Lock, as a first-of-its-kind hardware co-obfuscation countermeasure for System-in-Package. In SHI-Lock, by relying on a chiplet-hardware-security-module (CHSM), a co-obfuscation mechanism has been shared (interaction-based) between the chiplet designer(s) and the SiP integrator, allowing them to extend the protection in both intra-chiplet and inter-chiplet domains. SHI-Lock consists of a {obfuscation + key provisioning} protocol that enables forward trusts for chiplet designers to extend the chiplet-level obfuscation techniques to be used in multiple SiP designs. The co-obfuscation relies on a finite-state-machine (FSM) obfuscation and acts as a license activation protocol in HI. We evaluate the robustness of SHI-Lock using various metrics and threats including functional and structural attacks and perform overhead analysis of design-under-obfuscation, verifying that SHI-Lock can effectively be integrated into chiplets to create obfuscation at both Chiplet-level and system-level to protect SiPs from piracy and overproduction.