stegano's Introduction
PETRUSCA BOGDAN MIHAI 323CB Pentru taskul1 am parcurs imaginea pana cand gasesc cuvantul "revient". Atunci cand gasesc cuvantul respectiv adaug in variabila "line" linia unde se afla propozitia. Utilizez functia "afisare_mesaj" pentru a afisa propozitia pana cand la '.'. Pentru taskul2 decriptez mesajul cu linia data si pun linia si key-ul in eax astfel: adaug in registru mai intai cheia, dupa aceea shiftez la stanga cu 16 si adaug cheia. Dupa aceea adaug caracter cu caracter in fiecare pixel propozitia ceruta si criptez mesajul cu cheia ceruta dupa ce fac operatiile necesare. Pentru taskul3 parcurg enuntul si adaug codul morse al fiecarei litere pe fiecare pixel de la offsetul dat. Pentru taskul4 extrag ultimul bit al fiecarui pixel si il compar cu fiecare bit al fiecarei litere. Dupa aceste comparatii ori scad cu 1, ori adaug 1 in pixel. Pentru taskul5 adaug intr-un registru 8 biti si afisez registrul respectiv. In cazul in care registurl are valoare 0 ( adica cei 8 biti sunt 0) ma opresc. Mai vreau sa precizez ca tema a fost foarte muncitoresca (mai ales taskul 3) si nu consider ca ne-a invatat ceva util deoarece fiecare task avea cam aceeasi idee. De asemenea puteati sa nu folositi argumente in linia de comanda pentru a putea rula debugerul din sasm. Astfel se puteau gasi bug-urile mult mai usor. Multumesc!
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