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8 CONCLUSIONS
The widespread use of cloud data storage and the
attractive properties offered by the attribute based
mechanisms lead us to combine them in order to en-
sure data security and user’s privacy. In this paper, we
have proposed a novel threshold attribute based sign-
cryption (t-ABSC) scheme ensuring flexible access
control, data confidentiality, user’s privacy as well as
data origin authentication with anonymity. Moreover,
the size of signcrypted messages does not depend on
the number of attributes involved in the access pol-
icy, which makes our t-ABSC scheme more suitable
for bandwidth-limited applications. Finally, our con-
struction is proven to ensure strong security properties
in the random oracle model, namely confidentiality
against the chosen ciphertext attacks, unforgeability
against chosen message attacks and privacy preserva-
tion, based on formal security games.
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