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Security for cyber-physical systems: Secure control against known-plaintext attack

Science China(Technological Sciences) 2020年第9期63卷 1637-1646页

作者： YUAN Ye MO YiLin School of Artificial Intelligence and Automation Hluatchong University of Science and TechmologyWuhan 430074China Department of Automation BNRistTsinghua UniversityBeijing 100084China

There has been a surge of interests in the security of cyber-physical systems(CPSs), yet it is commonly assumed that the adversary has a full knowledge of physical system models. This paper argues that such an unrealistic assumption can be relaxed: the adversary might still be able to identify the system model by passively observing the control input and sensory data. In such a setup, the attack with knowledge of input-output data can be categorized as a known-plaintext attack. A necessary and sufficient condition has been provided, under which the adversary can uniquely obtain the knowledge of the underlying physical *** the defender's perspective, a secure controller design—which exhibits a low rank structure—is proposed which renders the system unidentifiable to the adversary, while trading off the control system's performance. Finally, a numerical example has been provided to demonstrate the effectiveness of the proposed secure controller design.

关键词： cyber-physical systems security secure control known-plaintext attack

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known-plaintext attack on the double phase encoding and its implementation with parallel hardware

Known-plaintext attack on the double phase encoding and its ...

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2007亚洲光电子会议信息光学与光子学技术分会场

作者： Bruce Z. Gao Bioengineering Department Clemson University Clemson SC 29634 USA

A known-plaintext attack on the double phase encryption scheme implemented with parallel hardware is presented. The double random phase encoding （DRPE） is one of the most representative optical cryptosystems developed in mid of 90’s and derives quite a few variants since then. Although the DRPE encryption system has a strong power resisting to a brute-force attack, the inherent architecture of DRPE leaves a hidden trouble due to its linearity nature. Recently the real security strength of this opto-cryptosystem has been doubted and analyzed from the cryptanalysis point of view. In this presentation, we demonstrate that the optical cryptosystems based on DRPE architecture are vulnerable to known-plain text attack. With this attack the two encryption keys in the DRPE can be accessed with the help of the phase retrieval technique. In our approach, we adopt hybrid input-output algorithm （HIO） to recover the random phase key in the object domain and then infer the key in frequency domain. Only a plaintext-ciphertext pair is sufficient to create vulnerability. Moreover this attack does not need to select particular plaintext. The phase retrieval technique based on HIO is an iterative process performing Fourier transforms, so it fits very much into the hardware implementation of the digital signal processor （DSP）. We make use of the high performance DSP to accomplish the known-plaintext attack. Compared with the software implementation, the speed of the hardware implementation is much fast. The performance of this DSP-based cryptanalysis system is also evaluated.

关键词： Information optics Information security Double random phase encoding known-plaintext attack Digital signal processing

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Cryptanalysis of an image encryption scheme based on the Hill cipher

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第8期9卷 1118-1123页

作者： Cheng-qing Dan ZHANG Guan-rong CHEN Department of Electronic Engineering City University of Hong Kong Kowloon Tong Hong Kong China School of Computer Science and Technology Zhejiang University Hangzhou 310027 China

This paper studies the security of an image encryption scheme based on the Hill cipher (Ismail et al., 2006) and reports its following problems: (1) There is a simple necessary and sufficient condition that makes a number of secret keys invalid; (2) It is insensitive to the change of the secret key; (3) It is insensitive to the change of the plain-image; (4) It can be broken with only one known/chosen plaintext; (5) It has some other minor defects. The proposed cryptanalysis discourages any use of the scheme in practice.

关键词： Cryptanalysis Encryption Hill cipher known-plaintext attack Chosen-plahltext attack

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