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criptare-si-decriptare-xor's Introduction

Criptare-si-decriptare-XOR

TO ENCRYPT:

python encrypt.py "parola" "input file" "output file"

TO DECRYPT:

python decrypt.py "output file" "parola" "input_recuperat file"

Echipa noastra: Girafele

Echipa adversa: MontBlanc

Parola echipei adverse: S12permut0SSSS

PARTEA 1:

Pentru a afla parola adversarilor, am folosit urmatoarea gandire:

input ^ parola = output input ^ output = input ^ ( input ^ parola ) = input ^ input ^ parola = 0 ^ parola = PAROLA

Astfel, am folosit un program in python, in care xoram fiecare caracter din input cu fiecare caracter din output, astfel parola va aparea in mod repetat. Stiind ca parola are intre 10 si 15 caractere, am luat in considerare doar primele astfel de caractere, si ne-am folosit de programul de criptare pentru a verifica daca output-ul generat este identic cu cel dat de adversari. In momentul in care cele 2 fisiere output erau identice, ne-am asigurat ca aceasta este parola.

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