Multi-Authority Verifiable Attribute-Based Encryption
Dongyao Ji · Journal of Wuhan University · 2008
This paper generalizes the verifiable attribute-based encryption(VABE) with a single authority to the multi-authority scenario.When the authorized user could not decrypt the message in a multi-authority ABE,the user could figure out which authority's secret key has problem and ask this authority to resend the key.Secondly,when an authority's key did not pass the verification,it needs only to resend the corresponding part of the key instead of all the information for computing the key.Thirdly,if all keys are verified right,but the user still could not decrypt,then,something must be wrong with the ciphertext or the attributes.At last,we prove that adding the information for verification does not reduce the security of the multi-authority ABE.