Changji Wang1, *, Yuan Yuan2
CMC-Computers, Materials & Continua, Vol.63, No.2, pp. 1031-1041, 2020, DOI:10.32604/cmc.2020.06278
Abstract Ciphertext-policy attribute-based encryption (CP-ABE) is a promising
cryptographic solution to the problem for enforcing fine-grained access control over
encrypted data in the cloud. However, when applying CP-ABE to data outsourcing
scenarios, we have to address the challenging issue of policy updates because access
control elements, such as users, attributes, and access rules may change frequently. In this
paper, we propose a notion of access policy updatable ciphertext-policy attribute-based
encryption (APU-CP-ABE) by combining the idea of ciphertext-policy attribute-based key
encapsulation and symmetric proxy re-encryption. When an access policy update occurs,
data owner is no longer required to download any data for… More >
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