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All Journal Journal of ICT Research and Applications International Journal of Computing Science and Applied Mathematics MULTINETICS eProceedings of Engineering Jurnal Pengabdian Masyarakat Bangsa
Farah Afianti
Telkom University
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Journal : Journal of ICT Research and Applications

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Strengthening Crypto-1 Cipher Against Algebraic Attacks Farah Afianti; Ari M. Barmawi
Journal of ICT Research and Applications Vol. 9 No. 1 (2015)
Publisher : LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.ict.res.appl.2015.9.1.5

Abstract

In the last few years, several studies addressed the problem of data security in Mifare Classic. One of its weaknesses is the low random number quality. This causes SAT solver attacks to have lower complexity. In order to strengthen Crypto-1 against SAT solver attacks, a modification of the feedback function with better cryptographic properties is proposed. It applies a primitive polynomial companion matrix. SAT solvers cannot directly attack the feedback shift register that uses the modified Boolean feedback function, the register has to be split into smaller groups. Experimental testing showed that the amount of memory and CPU time needed were highest when attacking the modified Crypto-1 using the modified feedback function and the original filter function. In addition, another modified Crypto-1, using the modified feedback function and a modified filter function, had the lowest percentage of revealed variables. It can be concluded that the security strength and performance of the modified Crypto-1 using the modified feedback function and the modified filter function are better than those of the original Crypto-1.
Co-Authors Ari M. Barmawi Favian Dewanta Hanifan, Abdullah Muhammad Arzaki Prasetyo Nugroho, Ecky Purwiko, Daniel Perdana Putra Rahardja, Khairunnisa Novitania Raissa Henardianti Hanifa Setyorini Setyorini Siti Saadah