Programmable Interposer Switching for Reconfigurable SiP Security

The patent applies the dynamics principle by replacing fixed interconnect structures with reconfigurable switches (e.g., anti-fuse, PMC, or transistor-based switches) that can dynamically change their electrical state between conducting and non-conducting. This allows the interposer to adapt its connectivity pattern after fabrication, enabling field reconfiguration and customization without requiring physical restructuring of the interposer itself.

The patent employs parameter changes by utilizing materials and mechanisms whose electrical properties can be altered post-fabrication. For example, anti-fuse elements transition from high to low resistance when programmed, and PMC switches change resistance states through electrochemical processes. These parameter changes enable reconfigurability while maintaining a relatively simple physical structure.

The patent applies preliminary action by incorporating security-critical interconnect configuration into the interposer design that can be finalized and secured after the ICs are fabricated in non-trusted environments. The reconfigurable switches remain in a default or unprogrammed state during initial fabrication, allowing the physical manufacturing to occur in flexible, cost-effective facilities while the security-sensitive connectivity patterns are established later in trusted environments through programming or configuration processes.

The patent uses the interposer itself as an intermediary layer between the ICs and the external world, with reconfigurable switches acting as mediators that can control and obscure the true connectivity patterns. This intermediary structure allows secure configuration to be applied after fabrication, separating the manufacturing phase (which can occur in non-trusted environments) from the security-critical configuration phase (which occurs in trusted environments).