IEEE Trans Image Process - Image integrity authentication scheme based on fixed point theory.

Tópicos

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Resumo

Based on the fixed point theory, this paper proposes a new scheme for image integrity authentication, which is very different from digital signature and fragile watermarking. By the new scheme, the sender transforms an original image into a fixed point image (very close to the original one) of a well-chosen transform and sends the fixed point image (instead of the original one) to the receiver; using the same transform, the receiver checks the integrity of the received image by testing whether it is a fixed point image and locates the tampered areas if the image has been modified during the transmission. A realization of the new scheme is based on Gaussian convolution and deconvolution (GCD) transform, for which an existence theorem of fixed points is proved. The semifragility is analyzed via commutativity of transforms, and three commutativity theorems are found for the GCD transform. Three iterative algorithms are presented for finding a fixed point image with a few numbers of iterations, and for the whole procedure of image integrity authentication; a fragile authentication system and a semifragile one are separately built. Experiments show that both the systems have good performance in transparence, fragility, security, and tampering localization. In particular, the semifragile system can perfectly resist the rotation by a multiple of 90? flipping and brightness attacks.

Resumo Limpo

base fix point theori paper propos new scheme imag integr authent differ digit signatur fragil watermark new scheme sender transform origin imag fix point imag close origin one wellchosen transform send fix point imag instead origin one receiv use transform receiv check integr receiv imag test whether fix point imag locat tamper area imag modifi transmiss realiz new scheme base gaussian convolut deconvolut gcd transform exist theorem fix point prove semifragil analyz via commut transform three commut theorem found gcd transform three iter algorithm present find fix point imag number iter whole procedur imag integr authent fragil authent system semifragil one separ built experi show system good perform transpar fragil secur tamper local particular semifragil system can perfect resist rotat multipl flip bright attack

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