基于DDH假设和d-线性假设的平滑投影散列

Two new constructions of smooth projective hashing are presented over the languages defined by CCA2 secure public-key encryption schemes based on lossy trapdoor functions. One lossy trapdoorfunction is based on DDH assumption and the other is based on d -linear assumption.     

高效的基于陷门置换的可延迟验证聚合签名(英文)

Aggregate signature schemes are introduced to compress signatures under different keys into one. Sequential aggregate signature is a special kind of aggregate signature, in this kind of scheme, the aggregate signature is computed incrementally by the signers. There has been many sequential aggregate signature constructed. A main class of sequential aggregate signatures are based on trapdoor permutation. A construction of sequential aggregate signature is given which can be seen as an improvement of the scheme proposed by Brogle et. al. The scheme proposed releases one of the two random oracles used in Brogle et. al's construction, which makes the scheme more efficient.