Multi-granularity partial encryption method of CAD model

Model security for collaborative product design in a networked environment (or called networked manufacture, grid manufacture, and cloud manufacture) is an important and also challenging research issue. In order to support collaborative product design in a secure and flexible means, a multi-granularity partial encryption method has been proposed in this paper. Base on the above method, parts of a Computer Aided Design (CAD) model can be selected flexibly by users for encrypting with multi-granularity, according to different users´ requirements. The secret keys for the different parts of the CAD model can be customized to meet the requirements of users. Case studies have been developed to demonstrate the effectiveness of the proposed method.