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Reliable Re-encryption in Unreliable Clouds

Platform : Cloud Computing

IEEE Projects Years : 2012

Reliable Re-encryption in Unreliable Clouds

Abstract

A key approach to secure cloud computing is for
the data owner to store encrypted data in the cloud, and issue
decryption keys to authorized users. Then, when a user is
revoked, the data owner will issue re-encryption commands to
the cloud to re-encrypt the data, to prevent the revoked user
from decrypting the data, and to generate new decryption keys to
valid users, so that they can continue to access the data. However,
since a cloud computing environment is comprised of many cloud
servers, such commands may not be received and executed by all
of the cloud servers due to unreliable network communications.
In this paper, we solve this problem by proposing a timebased
re-encryption scheme, which enables the cloud servers to
automatically re-encrypt data based on their internal clocks. Our
solution is built on top of a new encryption scheme, attributebased
encryption, to allow fine-grain access control, and does not
require perfect clock synchronization for correctness.
Index Terms—Attribute-based encryption, cloud computing,
proxy re-encryption.


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