盲源分离图像加密的相关运算解密法

doi:1000-436X(2008)01-0109-06

Abstract

Abstract:

For a blind source separation (BSS) based method for encrypting multiple images,the multiple decrypted images by BSS may have changed order and reversed pixel values.In addition,decorrelation preprocessing must be performed prior to decryption of strongly correlated images.To solve the two problems,a novel method for image decryption was proposed based on correlation calculation since the key images are known for legal users and are independent of the original images.Specifically,the correlation matrix between the encrypted images and the key images was calculated according to the encryption equation,the decrypted images are then obtained by ignoring the smaller correlation matrix between the original images and the key images.The results of computer simulations and performance analyses demonstrate that the proposed method can provide much higher quality and much faster speed compared to the BSS decryption,and also can directly decrypt varied images.

Key words: blind source separation, image encryption, image decryption, correlation calculation

Qiu-hua LIN,Jie DANG,Fu-liang YIN. Correlation calculation decrypting for BSS-based image cryptosystem[J]. Journal on Communications, 2008, 29(1): 109-114.

Figures/Tables 7

	$R_{S N 1} / d B$	$R_{S N 2} / d B$	$R_{S N 3} / d B$	解密时间/s
本文方法	42.26	47.13	48.45	0.16
FastICA	14.64	21.01	28.67	3.22
ComonICA	16.72	25.27	28.20	5.14
JADE	15.74	23.91	26.65	2.73

	$R_{S N 1} / d B$	$R_{S N 2} / d B$	$R_{S N 3} / d B$	解密时间/s
本文方法	43.14	39.78	38.16	0.16
FastICA	22.39	24.27	18.87	4.98
ComonICA	17.64	24.96	18.17	5.70
JADE	18.24	24.41	18.13	2.99

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Correlation calculation decrypting for BSS-based image cryptosystem

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