Re-encryption Optimization in CP-ABE Based Cryptographic Cloud Storage

Nowadays, more and more customers begin to use the cryptographic cloud storage for protecting their data security. But the re-encryption caused by revocation is a sure performance killer in such a cryptographic access control system. We propose a novel scheme to reduce the consumption of the re-encryption process. This scheme is built on a series of cryptographic algorithms. The original data is split into several slices and these slices are published to the cloud storage. After a revocation occurs, we re-encrypt only one slice instead of the whole data. The comparison between our scheme and original one shows that the optimized scheme can reduce the costs of re-encryption significantly.