An Encryption-Authentication Unified A/D Conversion Scheme for IoT Sensor Nodes

Widely distributed sensors, in the IoT era, are vulnerable to attacks, including data sniffing and spoofing. Tamper resistance, data encryption and authentication, which are essential aspects of security of all IoT devices, are becoming ever more critical. We have proposed an Analog-to-Digital Conversion scheme, based on slope A/D conversion, involving two randomized slopes, to realize resistance to side channel attacks and perform data encryption-authentication during the A/D conversion process. We have designed and fabricated the proposed encryption-authentication unified ADC in 0.18μm CMOS process and demonstrated an ENOB of 7.64 bits, DNL = +/-0.6 LSBs and INL = +0.5/-0.4 LSBs at 24KS/s.