Chameleon eFPGA-based redaction gives IP owners a document-style "black-bar" capability for hardware: critical pieces are simply missing from the delivered gate-level description, yet can be re-instated in the field, delivering strong reverse-engineering protection without the vulnerabilities that plague traditional logic-locking.
Because the Chameleon eFPGA is hidden within the ASIC fabric, the attacker must simultaneously guess both the logic mapping and the routing configuration inside a regular, highly-flexible fabric, the search space explodes compared with traditional gate-locking.
oracle-guided SAT solvers take impractical time when hard cycles and large key-spaces are introduced
