On the Practical Security of Inner Product Functional Encryption

Functional Encryption (FE) is an exciting new paradigm that extends the notion of public key encryption. In this work we explore the security of Inner Product Functional Encryption schemes with the goal of achieving the highest security against practically feasible attacks. While there has been substantial research effort in defining meaningful security models for FE, known definitions run into one of the following difficulties – if general and strong, the definition can be shown impossible to achieve, whereas achievable definitions necessarily restrict the usage scenarios in which FE schemes can be deployed. We argue that it is extremely hard to control the nature of usage scenarios that may arise in practice. Any cryptographic scheme may be deployed in an arbitrarily complex environment and it is vital to have meaningful security guarantees for general scenarios. Hence, in this work, we examine whether it is possible to analyze the security of FE in a wider variety of usage s...

• Type: Journal
• Year: 2015
• Where: PKC
• Authors: Shashank Agrawal, Shweta Agrawal, Saikrishna Badrinarayanan, Abishek Kumarasubramanian, Manoj Prabhakaran, Amit Sahai
• Keywords: Cryptology, PKC 2015