University of Birmingham > Talks@bham > Computer Security Seminars > Fixed-Point Arithmetic in Somewhat Homomorphic Encryption Schemes

Fixed-Point Arithmetic in Somewhat Homomorphic Encryption Schemes

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Homomorphic encryption schemes allow users to meaningfully manipulate ciphertexts “without revealing” any information about the underlying plaintexts. In this work, we investigate issues related to performing fixed-point arithmetic homomorphically using existing fully/somewhat homomorphic encryption (FHE/SHE) schemes. We analyse and compare various encoding schemes to encode fractional numbers in the native algebraic plaintext space of an SHE scheme and derive bounds on the parameters to used by an SHE scheme. As an application of these bounds, we investigate homomorphic image processing and also perform an implementation using the HElib homomorphic encryption library.

This talk is part of the Computer Security Seminars series.

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