IMPLEMENTATION OF ROBUST SYSTEM TO GENERATE AUTHENTICATED ENCRYPTION FOR SECURE MESSAGE

Software Engineering

The purpose of this project was to boost the data security focusing on the tow levels of security, namely multimedia encryption and multimedia authentication. The aim is to propose a key-dependent function that returns the same numbers or bits from images and their encrypted versions. By incorporating encryption and hashing in one system, we can have two levels of security and we can prove the authenticity of the data without actually revealing the information. A discrete cosine transform (DCT) expresses a sequence of finitely many data points in terms of a sum of cosine functions oscillating at different frequencies. Watermark is a recognizable image or pattern that appears as various shades of lightness/darkness when viewed by transmitted light, caused by thickness or density variations. A hash function is any algorithm or subroutine that maps large data sets of variable length, called keys, to smaller data sets of a fixed length. Firstly, image is encrypted. For each image, first we compute the 16 × 16 block DCT. Then, each block is encrypted. Decryption is done on encrypted image. Finally, done the image comparison for an input image and an output image with the help of histogram. And the result obtained as expected.

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