METHOD FOR SECURE SUBSTRING SEARCH

摘要

A system and method for secure substring search, using fully homomorphic encryption, or somewhat homomorphic encryption. In one embodiment, a first string is homomorphically compared to trial substrings of a second string, each comparison producing a ciphertext containing an encrypted indication of whether the first string matches the trial substrings. These ciphertexts are then combined in a homomorphic logical OR operation to produce a ciphertext which contains an encrypted indication of whether the first string matches any of the trial substrings, i.e., whether the first string is contained in the second string.

主权项

1. A method for determining whether a first string is a substring of a second string, the method comprising:
performing a first sequence of operations, on:
a set of first ciphertexts corresponding to the first string; anda set of second ciphertexts corresponding to a trial substring of the second string, to form a resulting third ciphertext containing an encrypted indication of whether the first string matches the trial substring.