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Erschienen in:
2010 | OriginalPaper | Buchkapitel
A Simple BGN-Type Cryptosystem from LWE
verfasst von : Craig Gentry, Shai Halevi, Vinod Vaikuntanathan
Erschienen in: Advances in Cryptology – EUROCRYPT 2010
Verlag: Springer Berlin Heidelberg
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We construct a simple public-key encryption scheme that supports polynomially many additions and one multiplication, similar to the cryptosystem of Boneh, Goh, and Nissim (BGN). Security is based on the hardness of the learning with errors (LWE) problem, which is known to be as hard as certain worst-case lattice problems.
Some features of our cryptosystem include support for large message space, an easy way of achieving formula-privacy, a better message-to-ciphertext expansion ratio than BGN, and an easy way of multiplying two encrypted polynomials. Also, the scheme can be made identity-based and leakage-resilient (at the cost of a higher message-to-ciphertext expansion ratio).