Electronic healthcare systems can offer convenience but face the risk of data forgery and information leakage. To solve these issues, we propose an identity-based searchable attribute signcryption in lattice for a blockchain-based medical system (BCMS-LIDSASC). BCMS-LIDSASC achieves decentralization and anti-quantum security in the blockchain environment, and provides fine-grained access control and searchability. Furthermore, smart contracts are used to replace traditional trusted third parties, and the interplanetary file system (IPFS) is used for ciphertext storage to alleviate storage pressure on the blockchain. Compared to other schemes, BCMS-LIDSASC requires smaller key size and less storage, and has lower computation cost. It contributes to secure and efficient management of medical data and can protect patient privacy and ensure the integrity of electronic healthcare systems.

电子医疗系统可以提供便利，但面临数据伪造和信息泄露的风险。为了解决这些问题，我们提出了一种基于身份的可搜索属性签密，用于基于区块链的医疗系统（BCMS-LIDSASC）。 BCMS-LIDSASC实现了区块链环境下的去中心化和抗量子安全，并提供细粒度的访问控制和可搜索性。此外，利用智能合约替代传统的可信第三方，利用星际文件系统（IPFS）进行密文存储，缓解区块链的存储压力。与其他方案相比，BCMS-LIDSASC 需要更小的密钥大小和更少的存储空间，并且具有更低的计算成本。它有助于安全、高效地管理医疗数据，并可以保护患者隐私并确保电子医疗系统的完整性。