645 research outputs found
Attribute-based encryption for cloud computing access control: A survey
National Research Foundation (NRF) Singapore; AXA Research Fun
A Ciphertext Policy Attributes-based Encryption Scheme with Policy Revocation
There are a lot of data exchanges among the parties by
using cloud computing. So data protection is very
important in cloud security environment. Especially, data
protection is needed for all organization by security
services against unauthorized accesses. There are many
security mechanisms for data protection. Attributes-based
Encryption (ABE) is a one-to-many encryption to encrypt
and decrypt data based on user attributes in which the
secret key of a user and the ciphertext are dependent
upon attributes. Ciphertext policy attributes-based
encryption (CP-ABE), an improvement of ABE schemes
performs an access control of security mechanisms for
cloud storage. In this paper, sensitive parts of personal
health records (PHRs) are encrypted by ABE with the
help of CP-ABE. Moreover, an attributes-based policy
revocation case is considered as well as user revocation
and it needs to generate a new secret key. In proposed
policy revocation case, PHRs owner changes attributes
policy to update available user lists. A trusted authority
(TA) is used to issue secret keys as a third party. This
paper emphasizes on key management and it also
improves attributes policy management and user
revocation. Proposed scheme provides a full control on
data owner as much as he changes policy. It supports a
flexible policy revocation in CP-ABE and it saves time
consuming by comparing with traditional CP-ABE
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