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Fully homomorphic encryption is a promising crypto primitive to encrypt yourdata while allowing others to compute on the encrypted data. But there are manywell-known problems with fully homomorphic encryption such as CCA security andcircuit privacy problem. Despite these problems, there are still many companiesare currently using or preparing to use fully homomorphic encryption to builddata security applications. It seems that the full homomorphic encryption isvery close to practicality and these problems can be easily mitigated inimplementation. Although the those problems are well known in theory, there isno public discussion of their actual impact on real application. Our researchshows that there are many security pitfalls in fully homomorphic encryptionfrom the perspective of practical application. The security problems of a fullyhomomorphic encryption in a real application is more severe than imagined. Inthis paper, we will take Microsoft SEAL as an examples to introduce thesecurity pitfalls of fully homomorphic encryption from the perspective ofimplementation and practical application

Danger of using fully homomorphic encryption: A look at Microsoft SEAL