1. State Key Laboratory of Industrial Control Technology, Zhejiang University, Hangzhou 310027, China; 2. Engineering at Electrical and Computer Engineering Department, University of Toronto M4Y1M7, Canada
Abstract：For those industrial control systems (ICS) whose field data need to be encrypted, a model, based on stability criterion is designed to assess the feasibility of the encrypted transmition mechanism. Combined with D-subdivision solution to transcentdental equation, a method to solve the feasible region of the length of encrypted data quantitatively is proposed. Integral absolute error (IAE) is improved to introduce the truncated IAE (TIAE)-based index, which is designed for evaluating the real-time performance influenced by the length in the feasible region. In terms of the relationship between execute time of encryption algorithm and length measured on embedded platform, two symmetric encryption algorithms for the control system of separately excited DC motor are evaluated, the accuracy of solution to the feasible region is verified, and the change law between real-time performance and length is obtained.
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2018, Vol. 44 
