IACR News item: 02 January 2016
Pratish Datta, Ratna Dutta, Sourav Mukhopadhyay
ePrint Report
Functional encryption (FE) supports constrained decryption keys that allow decrypters
to learn specific functions of encrypted messages. In numerous practical applications of FE, confidentiality
must be assured not only for the encrypted data but also for the functions for which
functional keys are provided. This paper presents a non-generic simple private key FE scheme for
the inner product functionality, also known as inner product encryption (IPE). In contrast to the
existing similar schemes, our construction achieves the strongest indistinguishability-based notion
of function privacy in the private key setting without employing any computationally expensive
cryptographic tool or non-standard complexity assumption. Our construction is built in the asymmetric
bilinear pairing group setting of prime order. The security of our scheme is based on the
well-studied Symmetric External Diffie-Hellman (SXDH) assumption.
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