# Security of certain homomorphic encryption scheme

Is the following homomorphic encryption scheme:

Ahmed El-Yahyaoui and Mohamed Dafir Ech-Chrif El Kettani, A Verifiable Fully Homomorphic Encryption Scheme for Cloud Computing Security (April 2018, at arXiv)

known to be secure/vulnerable against certain attacks? It sounds a bit to good, to be true.

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• The main security argument boils down to "Therefore, an adversary cannot then distinguish encryptions of units from encryptions of non-units. Consequently, the attack proposed on Li-Wang’s scheme [10] in [12] do not work for our case. Based on these assumptions, we believe that our fully homomorphic encryption scheme is indistinguishable under chosen ciphertext attacks"; which is short of modern academic standards. That does not imply wrong. – fgrieu May 22 '18 at 9:22