Strengthening copyright-1 Cipher Against Algebraic Attacks

Strengthening copyright-1 Cipher Against Algebraic Attacks

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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 copyright-1 against SAT solver attacks, a modification 730 sunken lake road 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 sex shop arles when attacking the modified copyright-1 using the modified feedback function and the original filter function.In addition, another modified copyright-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 copyright-1 using the modified feedback function and the modified filter function are better than those of the original copyright-1.