LFS-AS: Lightweight Forward Secure Aggregate Signature for e-Health Scenarios

The advancement of Internet of Medical Things (IoMT) leading to the proliferation of electronic healthcare scenarios, with an expanding trend of hospitals and healthcare organizations employing Electronic Medical Records (EMRs) with uploading to the cloud for sharing. However, security challenges exist during the generation and uploading of medical records, such as record tampering, key attacks, etc., which will become the maximum bottleneck restricting the development of e-Health scenarios in the near future. Some scholars consider digital signature techniques, such as Attribute-based Signature, to address the security challenges but ignoring its overwhelming efficiency. In this paper, we propose a lightweight forward secure aggregate signature for e-Health scenarios. We devise a lightweight secure aggregate signature to provide unforgeability and forward security for medical records, which is the first aggregate signature scheme that enables forward security in e-Health scenarios. Furthermore, our scheme offers superior lightweight properties, requiring only 5.78ms for aggregation and 4.85ms for verification of 1000 signatures, which is significantly lower than existing schemes, especially suitable for medical systems with enormous data volume. Security analysis and experimental evaluation indicate that our scheme assures correctness, unforgeability and forward security, while fulfilling lightweight demands that outperform existing schemes.