Abstract
We present several extensions to the ciphertext-policy attribute-based encryption CP-ABE scheme, first introduced by Bethencourt et al. in 2007, to support operation in a distributed environment with multiple attribute authorities. Unlike other efforts in creating a multi-authority attribute-based encryption schemes our extensions allow for each authority to be designated a subset of attributes and work independently in creating user keys i.e. a user need only contact a single authority for their secret key. Additionally, we show that the presented extensions have a minimal impact on performance compared to standard CP-ABE and that both the performance of CP-ABE and our extensions can be improved by computing parts of the user and authority keys in parallel. We also discuss the use of CP-ABE in protecting data confidentiality in public cloud environments.
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