Proper

Abstract

In previous privacy-preserving multi-authority attribute-based cryptography (PPMA-ABE) schemes, a user will acquire secret keys from multiple authorities with them knowing his/her attributes and moreover, a central authority is needed. Notably, a user’s identity information is extracted from his/her some sensitive attributes. Hence, existing will not completely defend users’ privacy as multiple authorities will collaborate to identify a user by assortment and analyzing his attributes. Moreover, cipher text-policy ABE (CPABE) is an extra economical public-key cryptography where the cypher or can opt for versatile access structures to write messages. Therefore, a tough and important work is to construct a PPMA-ABE theme where there is no necessity of obtaining the central authority and furthermore, every the identifiers and additionally the attributes is protected to be known by the authorities. Throughout this paper, a privacy-preserving localized CP-ABE (PPDCPABE) is projected to chop back the trust on the central authority and defend users’ privacy. In our PPDCP-ABE theme, each authority can work severally with none collaboration to initial the system and issue secret keys to users. A lot of extra, a user can get secret keys from multiple authorities without them knowing one thing regarding his world image (GID) and attributes.