it’s about use a Java for making porgram
it’s about use a Java for making porgram
An RC4 state is a 256 bytes states with two 8-bit index pointers i and j denoted by (S ,i ,j) The initial RC4 state is generated by KSA demoted by( S0, i=0, j=0).
An important feature of RCA is that the RC4 state is revertible That is, if (S* , i*, j*)=PRGAn (S ,i, j) it has (S ,i, j)=IPRGAn (S* , i*, j*)Where PRGAn demotes applying n rounds PRGA (samefor IPRGAn) and IPRGA is the reverse algorithm of PRGA. This feature means that any former
RC4 state can be recovered from a later RC4 state by applying certain rounds IPRGA.Write code to implementboth the PRGA algorithm and following IPRGA algorithm and design and implement a way confirm that any RC4 state can go forward by PRGA and backward by IPRGA.
IPRGA(S, i , j)
Generation loop;
S[i] ⟷ S[j]
j←(j-S[i ] +256)mod 256
i←(i -1)mod 256
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