基于EBS和属性加密的抗共谋组密钥管理方案

EBS-Based Collusion Resistant Group Key Management Using Attribute-Based Encryption

The major advantages of EBS-based key management scheme are its enhanced network survivability, high dynamic performance, and better support for network expansion. But it suffers from the collusion problem, which means it is prone to the cooperative attack of evicted members. A novel EBS-based collusion resistant group management scheme utilizing the construction of Cipher-text-Policy Attribute-Based Encryption (CP-ABE) is proposed. The new scheme satisfies the desired security properties, such as forward secrecy, backward secrecy and collusion secrecy. Compared with existing EBS-based key management scheme, the new scheme can resolve EBS collusion problem completely. Even all evicted members work together, and share their individual piece of information, they could not access to the new group key. In addition, our scheme is more efficient in terms of communication and computation overhead when the group size is large. It can be well controlled even in the case of large-scale application scenarios .