The Use Of Recent And Modern Multimedia Devices

1710 Words Sep 10th, 2015 7 Pages
The use of recent and modern multimedia devices which is connected to the internet like scanners, cameras, and especially smart tabs and cell phones made capture, storing, transmission, and sharing of a huge amount of images, songs, and videos much easier and faster
Cryptographic hash functions used to map the input data to a binary strings, different digital representations can emerge from an image through image processing like rotation, cropping, compression, filtering etc…, the change of one bit of the original data results in a radically different sequence [1][2]. The cryptographic hash functions are not appropriate for image authentication as they are sensitive to every single bit of input data.
Over the last decade, a growing
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Image perceptual hashing has been proposed to identify or authenticate image contents in a robust way against distortions caused by compression, noise, common signal processing and geometrical modifications, while still holding a good discriminability for different ones in sense of human perception

Alongside watermarking, perceptual image hashing has emerged as an attractive way to verify the authenticity of digital images [1], [5], [6]. Also, image hashing and watermarking could be complementary in that the watermark has to depend on both a secret key and image content to eliminate any possibility of estimating the watermark based on watermarked image observations; hence, the need for image hashes [7], [8]. Indeed, a secure hash can be used in watermarking to solve the problem of multiple ownership claims.

Traditionally, data integrity issues are addressed by cryptographic hashes or message authentication functions, such as MD5 and SHA1 [11], [12] which are sensitive to every bits of the input message. As a result, the message
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