International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 26 March 2013

Dingding Jia, Bao Liand Yamin Liu, Qixiang Mei
ePrint Report 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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