Attribute-Based Collaborative Access Control Scheme with Constant Ciphertext Length for Smart Grid

Attribute based encryption (ABE) is usually used for authorization to ensure data confidentiality because it can provide fine-grained access control. However, the data of smart grid is not completely divided, and there are many cases of collaborative access to data. The existing ABE based collaboration schemes have the defect that the ciphertext increases with the increase of attributes. Due to the limited storage and transmission capacity of smart grid equipment, the previous schemes are not suitable for smart grid. An attribute based collaborative access control scheme with constant ciphertext length for smart grid is proposed. By extending the collaborative nature to ABE with constant ciphertext length, the vacancy of collaborative ABE is made up. Performance analysis shows that this scheme is significantly better than the traditional collaborative ABE scheme in terms of storage and computing overhead. Security analysis shows that the scheme can ensure the confidentiality of data and support the revocation of collaborative at any time.