论文部分内容阅读
Two new constructions of chosen-ciphertext secure fuzzy identity-based encryption(fuzzy-IBE) schemes without random oracle are proposed.The first scheme combines the modification of chosen-plaintext secure Sahai and Waters’“large universe”construction and authenticated symmetric encryption, and uses consistency checking to handle with ill-formed ciphertexts to achieve chosen-ciphertext security in the selective ID model.The second scheme improves the effciency of first scheme by eliminating consistency checking.This improved scheme is more effcient than existing chosen-ciphertext secure fuzzy-IBE scheme in the standard model.
Two new constructions of chosen-ciphertext secure fuzzy identity-based encryption (fuzzy-IBE) schemes without random oracle are proposed.The first scheme combines the modification of chosen-plaintext secure Sahai and Waters’ “large universe ” construction and authenticated symmetric encryption, and consistency checking to handle with ill-formed ciphertexts to achieve chosen-ciphertext security in the selective ID model. second solution improves the effciency of first scheme by eliminating consistency checking. This improved scheme is more effcient than existing chosen-ciphertext secure fuzzy-IBE scheme in the standard model.