Testing a secure device: high coverage with very low observability

Secure microcontrollers used in smart card, are small, cost effective, system on chip including a mixtures of standard CPU, memories and dedicated functions added to protect the circuits against leakage or tampering. Testing the device require a high coverage while offering no access to internal information. Today solutions are based on combination of standard structural testing (scan) and functional testing. Both are usually using BIST solutions, based on hardware and firmware implementations. Secure devices includes special antileakage or antitampering dedicated functions.