Towards accountable authority attribute-based encryption
王永涛, Chen, Kefei, Long, Yu Yu · 高技术通讯：英文版 · 2013
An accountable authority attribute-based encryption(A-ABE)scheme is presented in this paper.The notion of accountable authority identity-based encryption(A-IBE)was first introduced by Goyal at Crypto’07.It is a novel approach to mitigate the(inherent)key escrow problem in identity-based cryptosystems.In this work,the concept of accountable authority to attribute-based encryption(ABE)setting is generalized for the first time,and then a construction is given.The scheme non-trivially integrates an A-IBE scheme proposed by Libert et al.with an ABE scheme.In our construction,a user will be identified by a pair(id,ω),where id denotes the user’s identity andωdenotes the set of attributes associated to the user.In addition,our construction is shown to be secure under some reasonable assumptions.