Crackmes

Name	Author	Language	Arch	Difficulty	Quality	Platform	Date	Solution	Comments

Crackme	Infos
Keygen Practice	This was a very fun challenge! I managed to write a keygen in nicely formatted C++ code for this. I hope someone finds use in this in the progress of understanding this binary. In my solution.txt file the analysis description is short, but then again there was not much to describe besides from that. A checksum algorithm with a lot of collision. I found that a string of 9 characters in the pattern [0-9a-zA-Z] yields many results. Attached is solution.txt and keygen.cpp. Compile with g++ -o keygen keygen.cpp and run ./keygen 50 to get 50 keys. I did not include the binary. Thanks for sharing!
Password Login	Fun crackme to start out with. Thanks for sharing!

Comment	Link
Fun challenge! I submitted the solution and keygen source code, the keygen by default generates 1 valid password each time it is run. You can generate 50 by invoking ./keygen 50. Thanks for sharing!	==>
@exhumer thank you, I didn't notice it was a clickable entity. Cheers! @b0b501337 You will find the password in the FAQ, it's crackmes.one (and if you encounter a crackme in which that password does not work, use crackmes.de)	==>
Potential spoiler ahead! Fun! I found two ways of solving this one; * Run it through the likes of IDA64 and Ghidra, whereas Ghidra helped me with looking past mangled names. Like this, the steps the code makes were good to follow and the password could be constructed. * Run it in gdb and break at the comparison in the (I don't want to spoil anything) function that verifies things; then I simply displayed the second parameter register. On a sidenote, how on earth do I submit a solution?	==>

crackmes.one