Analysis of Gong et al.'s CCA2-secure homomorphic encryption

Hyung Tae Lee*, San Ling, Huaxiong Wang

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

It is a well-known result that homomorphic encryption is not secure against adaptive chosen ciphertext attacks (CCA2) because of its malleable property. Very recently, however, Gong et al. proposed a construction asserted to be a CCA2-secure additively homomorphic encryption (AHE) scheme; in their construction, the adversary is not able to obtain a correct answer when querying the decryption oracle on a ciphertext obtained by modifying the challenge ciphertext (Theoretical Computer Science, 2016). Because their construction is very similar to Paillier's AHE, it appeared to support an additively homomorphic property, though they did not specify an evaluation algorithm for the scheme in their paper. In this paper, we present a simple CCA2 attack on their construction by re-randomizing the challenge ciphertext. Furthermore, we look into an additively homomorphic property of their construction. To do this, we first consider a typical candidate for an addition algorithm on ciphertexts, as provided for previous AHE constructions, and establish that it does not function correctly. Subsequently, we provide plausible evidence for the hardness of achieving an additively homomorphic property with their construction. According to our analysis, it seems hard to preserve an additively homomorphic property of their construction without any modification. In addition, as a minor contribution, we point out a flaw in the decryption algorithm of their construction and present a rectified algorithm for correct decryption.

Original languageEnglish
Pages (from-to)104-114
Number of pages11
JournalTheoretical Computer Science
Volume640
DOIs
Publication statusPublished - 9 Aug 2016
Externally publishedYes

Keywords

  • additively homomorphic encryption
  • adaptive chosen ciphertext attack
  • malleability

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