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.
Highlights
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
The present paper focuses on a new signal security system recently proposed in [1, 2], which is called the twodimensional circulation encryption algorithm (TDCEA)
TDCEA is an enhanced version of a previous image encryption scheme proposed by the same authors in [3, 4], named BRIE, which is the 1D counterpart of TDCEA
Summary
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]. To facilitate the description of TDCEA and BRIE, it is assumed that the plain image has size M × N, where M is the height and N is the width of the image
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