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June 11, 2019 13:43
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Find decryption function of lineair encryption function
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| ClrHome | |
| Disp "E(x) = ax + b in Z(m)" | |
| Input "m = ",M | |
| Input "a = ",A | |
| Input "b = ",B | |
| ClrHome | |
| Output(1,1,"E(x) = "+toString(A)+"x + "+toString(B)+" in Z("+toString(M)+")") | |
| Output(4,1,"Calculating...") | |
| remainder(A,M)→H | |
| For(I,1,M) | |
| If remainder((H*I),M)=1 | |
| Then | |
| I→P | |
| Goto 1 | |
| End | |
| End | |
| Lbl 1 | |
| ClrHome | |
| M-P*B→Q | |
| Output(1,1,"E(x) = "+toString(A)+"x + "+toString(B)+" in Z("+toString(M)+")") | |
| If B=0 | |
| Then | |
| Output(4,1,"D(y) = "+toString(P)+"y MOD "+toString(Q)) | |
| Else | |
| Output(4,1,"D(y) = "+toString(P)+"y + "+toString(Q)+" MOD "+toString(M)) | |
| End | |
| For(I,1,6) | |
| Disp "" | |
| End | |
| Pause "Press enter to exit" |
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