Cryptology ePrint Archive: Report 2018/201

Efficient Parallel Binary Operations on Homomorphic Encrypted Real Numbers

Jim Basilakis and Bahman Javadi

Abstract: A number of homomorphic encryption application areas, such as privacy-preserving machine learning analysis in the cloud, could be better enabled if there existed a general solution for combining sufficiently expressive logical and numerical circuit primitives to form higher-level algorithms relevant to the application domain. Logical primitives are more efficient in a binary plaintext message space, whereas numeric primitives favour a word-based message space before encryption. In a step closer to an overall strategy of combining logical and numeric operation types, this paper examines accelerating binary operations on real numbers suitable for somewhat homomorphic encryption. A parallel solution based on SIMD can be used to efficiently perform addition, subtraction and comparison operations in a single step. The result maximises computational efficiency, memory space usage and minimises multiplicative circuit depth. Performance of these primitives and their application in min-max and sorting operations are demonstrated. In sorting real numbers, a speed up of 25-30 times is observed.

Category / Keywords: implementation / implementation, homomorphic encryption

Date: received 19 Feb 2018

Contact author: j basilakis at westernsydney edu au

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Version: 20180222:155250 (All versions of this report)

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