A Scalable Key-Splitting Protocol for Secure Data Sharing in IoT Devices

Abstract: As the Internet of Things (IoT) technology is becoming more popular, the information that is being generated is in vast quantity and rich with sensitive information and that information has to be shared and processed safely within the cloud infrastructure. However, privacy preserving methods like secret sharing and secure multi-party computation need several encrypted shares to be exchanged with various nodes making the communication overhead of IoT devices large. This paper presents a safe data sharing model of the IoT systems, that is effective in reducing the overhead of communication. The combination of the performance advantages of the Elliptic Curve Cryptography (ECC) on secure key exchange, NTRU cryptosystem on efficient post-quantum cryptography, and a threshold based secret sharing scheme on distributed key management has been achieved in this respect. proxy re-encryption in this system also ensures that the key shares are distributed safely to the authorized stakeholders without causing harm to the original secret information. Thereby only one time the data are encrypted and therefore several key fragments are delivered to the receiver rather than several ciphertexts, thereby, reducing the overhead of communications but at the same time having high data confidentiality.

Keywords: Internet of Things, Data Sharing, Elliptic Curve Cryptography, NTRU Cryptosystem, Secret Sharing, Proxy Re Encryption.