Mix&slice for Efficient Access Revocation on Outsourced Data

A complex problem when outsourcing data to the cloud is access control management. Encryption, by wrapping with a self-enforcing protection layer, provides enforcement making resources intelligible only users holding necessary key. The real challenge becomes then efficient revocation of access. We address this and present an approach effectively efficiently enforce on stored at external providers. relies resource transformation that strong mutual inter-dependency in its encrypted representation. To revoke resource, it sufficient update small portion it, guarantee as whole (and any it) will become unintelligible those from whom revoked. Our experimental results show effectiveness our approach, confirm efficiency, especially managing large dynamic policy.