Optimized stream-cipher-based transciphering by means of functional-bootstrapping

ePrint Report: Optimized stream-cipher-based transciphering by means of functional-bootstrapping

Adda-Akram Bendoukha, Pierre-Emmanuel Clet, Aymen Boudguiga, Renaud Sirdey

Fully homomorphic encryption suffers from a large expansion in the size of encrypted data, which makes FHE impractical for low-bandwidth networks. Fortunately, transciphering allows to circumvent this issue by involving a symmetric cryptosystem which does not carry the disadvantage of a large expansion factor, and maintains the ability to recover an FHE ciphertext with the cost of extra homomorphic computations on the receiver …

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