Dynamic random generator using Scrambling and Hashing Technique (SHT) for authentication on mobile system communication

Telecommunication Engineering

To authentiate on mobile system communication, a random number should be usesd. This article uses scrambling technique combined of hashing for generating dynamic random number destinating for this authentication. Arnold Transform and Hilbert Transform are used for this as Scrambling Technique. We uses expansion function and reduces it to 256 bits using Hashing Technique function Message Digest like MD4 and MD4 xor with MD5 and MD. The input matrix could be also considerd as an image and all criteria for image evaluation could be considered as the PSNR(Peak Signal to Noise Ratio), SSIM (Structural SIMilarity), NPCR(Number of Pixel exchange rate), UACI (Unified Average Changing Intensity), Correlation and the binary entropy. PSNR for the two methods is near than the value 8 which is a good visual quality visualThe SSIM and Correlation also offers a best parameter which is near zero. The image transformed by scrambling methods and originals are no similitude and no correlation. The NPCR give also a good performance because 99% of pixels changed in the image. But the UACI is not more than 20%. So, the intensity light of the new image doesn’t change with the maximum. The algorithm of the scrambling is not resistant to the attack physic using difference power analysis.The dynamic key also could be evaluate using probability. thus has the behavior: very far from the ends of the key (00 ... 000 and 11 ... 111); very far from the previous key; several bits changed and very messy from the point of view bit zero and bit one and the penalty of bad extremity proximity. All key chosen keys have a probability by the extremity and proximity between 50% until 100%. The probability of the bit changed is to 50%, the entropy is near 100%. The result is only obtained if the system uses optimization of one bit changed.

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