NFC I2C bridge tag for contactless authentication and secured configuration of IoT devices OPTIGA™ Authenticate NBT is a high-performance NFC I2C bridge tag, Type 4 Tag certified by the NFC Forum, for single-tap IoT device authentication and secured configuration. It enables ultra-fast, contactless NFC communication between IoT devices and contactless readers such as smartphones. It is based on CC EAL 6+ (high) certified hardware and provides high security thanks to our acclaimed Integrity Guard 32 security architecture.