IACR News item: 26 March 2013
Dingding Jia, Bao Liand Yamin Liu, Qixiang Mei
ePrint Report
In Eurocrypt 2012, Lewko presented a fully secure IBE scheme in the
prime order setting based on the decisional linear assumption. We note that
some random factor involved in the ciphertext can further be used to hide yet another message
, and get a new fully secure IBE scheme with better message-ciphertext rate.
Similar to Lewko\'s
scheme, we use dual pairing vector space in prime order bilinear
groups to simulate the canceling and parameter hiding properties of
composite order settings. The security of our scheme is based on the
subspace assumption, which can be reduced to the decisional linear
assumption. We employ the dual system encryption technique in our
security proof.
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