Random Number Generator Based on Discrete Cosine Transform Based Lossy Picture Compression

Year 2021, Volume: 2 Issue: 2, 76 - 85, 18.12.2021

Selman Yakut

https://doi.org/10.46572/naturengs.1009013

Cited By: 2

Abstract

The The widespread use of digital data makes the security of this data important. Various cryptographic systems are used to ensure the security of this data. The most important part of these systems is random numbers. In this article, a random number generator based on the discrete cosine transform, which is the basis of image compression algorithms, is proposed. In this generator, the difference between the original image and the compressed image produced using the discrete cosine transform is used. The original picture is transferred to the frequency plane using the discrete cosine transform. It is then converted back to the space plane using the inverse discrete cosine transform. These transformations cause some losses as certain coefficients are taken into account. Raw random numbers were generated using the differences between the original image and the compressed image. Then, the possible weaknesses in the random numbers generated by passing these raw data through the hash function were fixed. The SHA-512 algorithm was used as the hash function. An important advantage of the developed system is that it can be easily produced using any digital data source. It has been shown by the analysis that the generated random numbers are safe.

Keywords

Discrete cosine transform, Image compression, Random numbers, Hash functions.

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