Efficient distributed access control for big data in clouds

摘要: The term big data refers to the massive amounts of digital information, which can be efficiently stored and processed on a cloud computing platform. However, security privacy issues are magnified by high volume, variety, velocity data. Ciphertext-Policy Attribute-Based Encryption (CP-ABE) is promising cryptographic primitive for storage system bring together leakage prevention fine-grained access control. existing researches applying CP-ABE mainly focus efficiency decryption user revocation, some special improvements have been done alleviate workloads owners users, such as proxy re-encryption outsourcing. complexity revocation still linearly correlated with number ciphertexts users in system. Therefore, environment mass challenge. In this paper, we propose distributed, scalable control scheme efficient clouds. We also present new multi-authority supporting outsourcing, dynamically joining exiting attribute authorities. our scheme, only related revoked achieve both forward backward security. analysis shows that provably secure generic group model.