METHOD FOR PROCESSING HOMOMORPHIC ENCRYPTION AND ELECTRONIC APPARATUS

Abstract

A ciphertext processing method of an electronic apparatus is disclosed. The method includes storing a plurality of first homomorphic ciphertexts homomorphically encrypted according to a first scheme, and transforming the plurality of stored first homomorphic ciphertexts into a second homomorphic ciphertext according to a second scheme. The transforming comprises generating one third homomorphic ciphertext corresponding to a first region of each of the plurality of first homomorphic ciphertexts, generating one fourth homomorphic ciphertext corresponding to a second region of each of the plurality of first homomorphic ciphertexts, and generating the second homomorphic ciphertext by using the third homomorphic ciphertext and the fourth homomorphic ciphertext, wherein the second region excludes the first region from the entire region.

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