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Little Puzzle Applications for Reverse Code Engineers, with the goal to break a protection scheme legally for exercise. These often have a lot of built-in security to prevent attackers from succeeding, at the end the reverse engineer often writes a so-called keygen (key generator) and a paper to show s/he succeeded and how.

0
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Let's say we have a simple crackme, which asks for a password. After verifying it, eax will contain 1 if it is correct, and 0 otherwise. Is there a way (I am interested both in Linux and Windows) for …
asked Sep 18 '18 by robert
4
votes
2answers
I am interested in the anti-debugging method implemented in the crackme called trace-p. A child process is forked, which communicates with the parent using int3 instructions. I would like to debug …
asked Dec 29 '15 by robert
2
votes
2answers
I am studying IOLI crackme0x02. It is clear to me that rewriting the jump at 0x8048451 with no instructions the crackme can be patched. However, I want to understand better what the code does. My … address they are pointing to are the password. I have two questions regarding this crackme: Where is located the entered password? I do not understand what I get here: Breakpoint 1, 0x0804843c in main …
asked Dec 20 '15 by robert