Ciphertext comparison method using homomorphic encryption and apparatus for performing the same
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United States of America
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Mar 15, 2022
Grant Date -
Apr 30, 2020
app pub date -
Oct 23, 2019
filing date -
Oct 23, 2019
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Abstract
A ciphertext comparison method uses homomorphic encryption. An apparatus performs the ciphertext comparison method using the homomorphic encryption. The ciphertext comparison method using homomorphic encryption includes acquiring a first ciphertext obtained by encrypting first real-number data using a homomorphic evaluation algorithm and a second ciphertext obtained by encrypting second real-number data using the homomorphic evaluation algorithm, and generating a ciphertext for a result for comparison in size between the first real-number data and the second real-number data using homomorphic evaluation for the first ciphertext, the second ciphertext, and an approximation function for approximating a signum function.
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