FAST CP-ABE WITH ACCOUNTABILITY AND OUTSOURCED DECRYPTION FOR IOT SYSTEMS

Abstract

Cryptography based on identity and attributes enhances the possibility of secure communication on a large scale. Several attribute-based encryption (ABE) schemes achieve different objectives when deployed in various protocols. Most of these are suitable for large systems such as cloud services. However, only a few protocols focus on reducing the computational overhead for lower-end devices like Internet of Things (IoT) sensors and actuators. It is desirable to have a combination of features in protocols for IoT security architecture. We propose a hybrid protocol that enforces user accountability and outsourced decryption in IoT systems and achieves full security under the random oracle model. The protocol is proven to be CPA-secure, accountable, and unlinkable.