Iasta: An Efficient Cipher for Hybrid Homomorphic Encryption in Cloud-Assisted IoT

This paper presents Iasta, a new stream cipher (an encryption method that processes data one piece at a time) designed to work efficiently with hybrid homomorphic encryption (HHE, a technique that lets servers perform calculations on encrypted data without decrypting it first) in IoT (Internet of Things) systems. The problem it solves is that existing HHE systems are too slow and use too much computer power on devices and servers. Iasta improves performance by using special mathematical techniques and a redesigned encryption structure, achieving 2-5 times faster speeds compared to the previous best option (Pasta).