Cloud manufacturing is one of the three key technologies that enable intelligent manufacturing. This paper presents a novel attribute-based encryption (ABE) approach for computer-aided design (CAD) assembly models to effectively support hierarchical access control, integrity verification, and deformation protection for co-design scenarios in cloud manufacturing. An assembly hierarchy access tree (AHAT) is designed as the hierarchical access structure. Attribute-related ciphertext elements, which are contained in an assembly ciphertext (ACT) file, are adapted for content keys decryption instead of CAD component files. We modify the original Merkle tree (MT) and reconstruct an assembly MT. The proposed ABE framework has the ability to combine the deformation protection method with a content privacy of CAD models. The proposed encryption scheme is demonstrated to be secure under the standard assumption. Experimental simulation on typical CAD assembly models demonstrates that the proposed approach is feasible in applications.

云制造是使能智能制造的三大关键技术之一。本文提出了一种用于计算机辅助设计 (CAD) 装配模型的新型基于属性的加密 (ABE) 方法，以有效支持云制造中协同设计场景的分层访问控制、完整性验证和变形保护。程序集层次访问树 (AHAT) 被设计为层次访问结构。包含在汇编密文 (ACT) 文件中的与属性相关的密文元素适用于内容密钥解密，而不是 CAD 组件文件。我们修改原始 Merkle 树 (MT) 并重建程序集 MT。所提出的 ABE 框架能够将变形保护方法与 CAD 模型的内容隐私相结合。在标准假设下，所提出的加密方案被证明是安全的。对典型 CAD 装配模型的实验仿真表明，所提出的方法在应用中是可行的。