HBMorphic: FHE Acceleration via HBM-Enabled Recursive Karatsuba Multiplier on FPGA

Hassan Nassar, Lars Bauer, Jörg Henkel

Abstract: Cloud computing offers advantages such as seamless scalability and speedup of computation. Nevertheless, these benefits come with notable tradeoffs, e.g., processing sensitive data without compromising security. Fully Homomorphic Encryption (FHE) solves this by processing of encrypted data. In this work, we develop an FHE hardware accelerator that uses a custom control interface to maximally utilize the bandwidth of HBM, following the memory access patterns of FHE.