无线体域网(wireless body area networks,WBANs)在远程医疗、健康监测等服务领域有着广泛的应用前景,为了减少数据访问者和数据拥有者的计算量,提供低延迟的辅助医疗服务,结合数字信封技术提出云外包可撤销的属性加密方案,该方案将解密密钥分为两部分,采用云服务器对密文部分解密的方法,使得属性撤销操作不会对数据访问者和数据拥有者产生影响,分析证明该方案充分发挥云计算的优势,高效地对数据进行加密处理,并且方案也保证了数据的机密性,并具有抗共谋攻击。 Wireless body area networks (WBANs) have broad application prospects in the fields of telemedicine, health monitoring and other services. In order to reduce the computational load of data visitors and data owners and provide low-latency supplementary medical services, combined with the digital Envelope technology proposes a cloud-based reusable attribute encryption scheme. The scheme divides the decryption key into two parts. The cloud server partially decrypts the ciphertext so that the attribute undo operation will not affect the data visitor and the data owner , The analysis proves that the scheme gives full play to the advantages of cloud computing, encrypts the data efficiently, and the scheme also ensures the confidentiality of the data and has the anti-collusion attack.