Cryptanalysis of a new signal security system for multimedia data transmission

Authors:
Chengqing Li;Shujun Li;Guanrong Chen;Gang Chen;Lei Hu
Affiliations:
Department of Mathematics, Zhejiang University, Hangzhou, China;Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong;Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong;Department of Mathematics, Zhejiang University, Hangzhou, China;State Key Laboratory of Information Security, Graduate School of Chinese Academy of Sciences, Beijing, China
Venue:
EURASIP Journal on Applied Signal Processing
Year:
2005

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Abstract

Recently, a new signal security system called TDCEA (two-dimensional circulation encryption algorithm) was proposed for real-time 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.