Cryptanalysis of a New Signal Security System for Multimedia Data Transmission
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Cryptanalysis of a New Signal Security System for Multimedia Data Transmission Chengqing Li Department of Mathematics, Zhejiang University, Hangzhou 310027, China Email: [email protected]
Shujun Li Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong Email: [email protected]
Guanrong Chen Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong Email: [email protected]
Gang Chen Department of Mathematics, Zhejiang University, Hangzhou 310027, China Email: [email protected]
Lei Hu State Key Laboratory of Information Security, Graduate School of Chinese Academy of Sciences, Beijing 100049, China Email: [email protected] Received 23 August 2004; Revised 4 January 2005; Recommended for Publication by C. C. Jay Kuo Recently, a new signal security system called TDCEA (two-dimensional circulation encryption algorithm) was proposed for realtime multimedia data transmission. This paper gives a comprehensive analysis on the security of TDCEA. The following security problems are found: (1) there exist some essential security defects in TDCEA; (2) two known-plaintext attacks can break TDCEA; (3) the chosen-plaintext and chosen-ciphertext versions of the aforementioned two known-plaintext attacks can break TDCEA even with a smaller complexity and a better performance. Some experiments are given to show the security defects of TDCEA and the feasibility of the proposed known-plaintext attacks. As a conclusion, TDCEA is not suitable for applications that require a high level of security. Keywords and phrases: TDCEA, image encryption, chaos, cryptanalysis, known/chosen-plaintext attack, multimedia.
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INTRODUCTION
In today’s digital world, the security of multimedia data, for example, digital speech, image and video files, becomes more and more important due to their frequent transmission over open networks. In some real applications, such as pay-TV, medical imaging systems, military image/database communications, and confidential video conferences, highly secure and reliable storage and transmission of multimedia data are needed. To fulfill such a demand, many encryption schemes have been proposed as possible solutions [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]. Meanwhile, cryptanalysis work has also been developed, and some of the
proposed schemes have been found to be insecure [9, 10, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25]. For a comprehensive survey of the state-of-the-art of image and video encryption, see [26]. The present paper focuses on a new signal security system recently proposed in [1, 2], which is called the twodimensional circulation encryption algorithm (TDCEA). In fact, TDCEA is an enhanced version of a previous image encryption scheme proposed by the same authors in [3, 4], named BRIE (bit recirculation image encryption), which is the 1D counterpart of TDCEA. The original BRIE scheme has been successfully cryptanalyzed in [19], showing its insecurity against known-/chosen-plaintext attacks. Although
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