Identity-Based Cipher Text Conversion with Revocation Ability and Its Application in the Cloud Computing Environment

Abstract

Identity-based definitely encryption is a public key cryptosystem and eliminates the desires of public key infrastructure and certificate management in traditional public key settings. Due to the absence of PKI, the revocation trouble is a vital difficulty in IBE settings. Several revocable IBE schemes had been proposed concerning this issue. Quite lately, with the useful resource of embedding an outsourcing computation method into IBE, Li et al. Proposed a revocable IBE scheme with a key-update cloud company issuer. However, their scheme has shortcomings. One is that the computation and conversation costs are better than previous revocable IBE schemes. The extraordinary shortcoming is lack of scalability in the feel that the KU-CSP needs to hold a mystery fee for each person. In the thing, we recommend a cutting-edge revocable IBE scheme with a cloud revocation authority to remedy the two shortcomings, especially, the performance is significantly superior and the CRA holds simplest a device secret for all the customers. For safety evaluation, we display that the proposed scheme is semantically relaxed under the decisional bilinear Diffie-Hellman assumption. Finally, we make bigger the proposed revocable IBE scheme to provide a CRA-aided authentication scheme with period-restricted privileges for coping with a big type of various cloud offerings.