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| Blind Detection of LSB Steganography Based on a Cubic Equation |
| Lu Pei-zhong①; Luo Xiang-yang②; Tang Qing-yang①; Shen Li②; Zou Yan① |
| ①Department of Computer Science and Engineering Fudan University Shanghai 200433 China;②Institute of Information Engineering Information Engineering University Zhengzhou 450002 China |
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Abstract This paper presents a fast algorithm to detect the Least Significant Bit (LSB) steganography. The new approach is inspired by the work of Dumitrescu et al(2003) who detected LSB steganography via sample pair analysis. The new algorithm combines with the statistical measures developed by Dumitrescu and a new least square estimation. A simple cubic equation is deduced to describe the length of hidden messages with relatively high robust and precision. Moreover, compared with Dumitrescu’s algorithm, the novel method has much lower false alarm rate of 5% than that of 13.79%, and the estimating precision is about 9% higher if the embedding ratio is less than 10%, and the speed is also about 15 % faster. Some theoretical derivations are also included.
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Received: 04 November 2003
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2005, Vol. 27 
