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Fully homomorphic encryption (FHE) allows computations over encrypted data.This technique makes privacy-preserving cloud computing a reality. Users cansend their encrypted sensitive data to a cloud server, get encrypted resultsreturned and decrypt them, without worrying about data breaches.  This project report presents a homomorphic instruction set emulator,CryptoEmu, that enables fully homomorphic computation over encrypted data. Thesoftware-based instruction set emulator is built upon an open-source,state-of-the-art homomorphic encryption library that supports gate-levelhomomorphic evaluation. The instruction set architecture supports multipleinstructions that belong to the subset of ARMv8 instruction set architecture.The instruction set emulator utilizes parallel computing techniques to emulateevery functional unit for minimum latency. This project report includes detailson design considerations, instruction set emulator architecture, and datapathand control unit implementation. We evaluated and demonstrated the instructionset emulator's performance and scalability on a 48-core workstation. CryptoEmuhas shown a significant speedup in homomorphic computation performance whencompared with HELib, a state-of-the-art homomorphic encryption library.

CryptoEmu: An Instruction Set Emulator for Computation Over Ciphers