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Special Section Articles

Customized Encryption of Computer Aided Design Models for Collaboration in Cloud Manufacturing Environment

[+] Author and Article Information
Xiantao Cai

Assistant Professor
School of Computer Science and Technology,
Wuhan University,
Wuhan 430072, China
e-mail: caixantao@whu.edu.cn

Weidong Li

Professor
Faculty of Engineering and Computing,
Coventry University,
Coventry CV1 5FB, UK
e-mail: weidong.li@coventry.ac.uk

Fazhi He

Professor
School of Computer Science and Technology,
Wuhan University,
Wuhan 430072, China
e-mail: fzhe@whu.edu.cn

Xiaoxia Li

Faculty of Engineering and Computing,
Coventry University,
Coventry CV1 5FB, UK
e-mail: xiaoxia.li@coventry.ac.uk

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received October 28, 2014; final manuscript received April 28, 2015; published online July 8, 2015. Assoc. Editor: Lihui Wang.

J. Manuf. Sci. Eng 137(4), 040905 (Aug 01, 2015) (10 pages) Paper No: MANU-14-1556; doi: 10.1115/1.4030592 History: Received October 28, 2014; Revised April 28, 2015; Online July 08, 2015

Computer aided design (CAD) models reflect design goals, intentions, and functions so that they are the key intellectual properties of companies. In a Cloud manufacturing environment, how to effectively protect the sensitive feature information for a model owner while enabling the owner to flexibly share the rest of the CAD model with collaborators is an important yet challenging research issue. In this paper, an innovative partial encryption approach, which is able to represent a CAD model into the granularity of sharing information in order to address various collaboration scenarios and customized requirements from the model owner and collaborators, is presented. The approach is composed of a customized encryption algorithm for a CAD model, a key based customized authorization algorithm for collaborators to decrypt shared features in the model, and a customized geometric transformation method to support the effective protection model-based visualization of the model for collaboration. With this approach, a CAD model can be flexibly encrypted to realize partial sharing of features and safe protection of the rest of the model according to collaboration requirements. Meanwhile, during encryption and decryption, the CAD model is always manifold no matter which feature is encrypted or decrypted to ensure user friendliness, model validity, and robustness of the approach. A case study is used to verify and illustrate the effectiveness of the approach. This research is a new attempt to design a content-based and customized encryption approach applicable to CAD model-based collaboration in a Cloud manufacturing environment.

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References

Figures

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Fig. 1

A typical collaborative scenario with different levels of encryption granularity of a CAD model

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Fig. 2

An example of the DLG: (a) the feature tree, (b) the CAD model, and (c) the DLG

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Fig. 3

The transformation of the feature f (a) the initial feature f and (b) the Hausdorff distance changing according to α

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Fig. 4

The encryption procedure of a CAD model

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Fig. 5

The initial model M0 and its DLG: (a) the model M0 and its feature tree and (b) the DLG of M0

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Fig. 6

(a) M0 is encrypted to M1 and the shape comparison between M0 and M1

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Fig. 7

Key-based authorization of M1

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Fig. 8

The secure sharing of the propeller part

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