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Motivated by the question of access control in cloud storage, the authors consider the problem using Attribute-Based Encryption (ABE) in a setting where users' credentials may change and cipher-texts may be stored by a third party. They find that a comprehensive solution to their problem must simultaneously allow for the revocation of ABE private keys as well as allow for the ability to update ciphertexts to reflect the most recent updates. Their main result is obtained by pairing two contributions: revocable storage and protecting newly encrypted data.
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