Image-oriented Ciphertext-Policy Attribute-Based Encryption System.

Ciphertext-Policy Attribute-Based Encryption technology binds ciphertext to attribute sets, which can realize fine-grained access control centered on data users. At present, research on attribute encryption mostly focuses on ordinary data, and there is no research on multimedia such as images. Therefore, an image-oriented Ciphertext-Policy Attribute-Based Encryption (CP-ABE) scheme is proposed. Firstly, the image is processed by wavelet decomposition, and four groups of wavelet coefficient matrices are obtained, which will be scrambling encrypted respectively, and then the encrypted image is obtained through wavelet reconstruction. Secondly, the key used for scrambling encryption is encrypted by Ciphertext-Policy Attribute-Based Encryption respectively. Finally, build a demo system on this basis. The experimental results show that there are differences in the quality of the images that can be accessed depending on different user attributes, which realize the fine-grained control of the users' decryption abilities.