SCALABLE REVOCATION IN CP-ABE WITH CONSTANT CIPHERTEXT LENGTH IN STORAGE CONSTRAINED IOT DEVICES

Abstract

Portable devices such as a smartphone or an IoT device can be used to selectively share secure data with several users. A Ciphertext-Policy Attribute based Encryp tion (CP-ABE) is a fine-grained encryption technique, which can serve as selective access control mechanism. Due to the resource constraints and battery limitation in mobile devices, there is a requirement of an efficient CP-ABE Scheme. In this work, we refer to a RSA-based CP-ABE scheme which does not use costly bilinear maps with efficient storage. Irrespective of the total number of attributes defined, the length ciphertext and secret keys remains constant. However, it is also important to support efficient revocation to protect from malicious users and allow valid users for uninterrupted access. The RSA-based CP-ABE scheme lacks support for revocation.