DOTNET PROJECT
Hidden
Ciphertext Policy Attribute-Based Encryption With Fast Decryption for Personal
Health Record System
Abstract:
Since cloud computing has
been playing an increasingly important role in real life, the privacy
protection in many fields has been paid more and more attention, especially, in
the field of personal health record (PHR). The traditional ciphertext-policy attribute-based
encryption (CP-ABE) provides the fine-grained access control policy for
encrypted PHR data, but the access policy is also sent along with ciphertext
explicitly. However, the access policy will reveal the users' privacy, because
it contains too much sensitive information of the legitimate data users. Hence,
it is important to protect users' privacy by hiding access policies. In most of
the previous schemes, although the access policy is hidden, they face two
practical problems: 1) these schemes do not support large attribute universe,
so their practicality in PHR is greatly limited and 2) the cost of decryption
is especially high since the access policy is embedded in the ciphertext. To
address these problems, we construct a CP-ABE scheme with efficient decryption,
where both the size of public parameters and the cost of decryption are
constant. Moreover, we also show that the proposed scheme achieves full
security in the standard model under static assumptions by using the dual
system encryption method.
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