Accountable-Authority Identity-Based Matchmaking Encryption and Its Application

Summary

This research proposes accountable-authority identity-based matchmaking encryption (A-IB-ME), which addresses key escrow and accountability for malicious behavior in IB-ME, where the authority can generate any identity's encryption and decryption keys. In A-IB-ME, the creator of an encipher box or decoder box can be implicated in disputes over key abuse. The authors give a formal definition and construction, a security proof under standard assumptions without random oracles, and a theoretical and experimental performance evaluation. They apply it to privacy-preserving user matching in mobile social networks.