An Identity-Based Encryption with Equality Test scheme for healthcare social apps

It is tricky to determine whether two ciphertexts contain the same message when the messages are encrypted with different public keys. public key encryption with equality test (PKEET) addresses this problem without decryption. By integrating PKEET with identity-based encryption, identity-based encryption with equality test (IBEET) simplifies the certificate management in PKEET. In this paper, we first propose an IBEET scheme that can resist offline message recovery attacks (OMRA) and requires neither the dual-tester setting nor the group mechanism. With the help of some mathematical assumptions, we demonstrate the security of our scheme. Experiment results reveal that our scheme is efficient. From the perspective of usability, we explain why our scheme is more appropriate to be applied in healthcare social Apps than other OMRA-resistant schemes.

Automated summary

This paper introduces public key encryption with equality test (PKEET) and identity-based encryption with equality test (IBEET) to address the problem of determining whether two ciphertexts contain the same message encrypted with different public keys, without decryption. The proposed IBEET scheme resists offline message recovery attacks (OMRA) and does not require the dual-tester setting or group mechanism. Security is demonstrated through mathematical assumptions, and experiment results show the efficiency of the scheme. From a usability perspective, the paper explains why the scheme is more suitable for healthcare social Apps compared to other OMRA-resistant schemes.