_ninar1_'s _ninar1_'s crackme 1
| Download crm1ninar1.zip, 1 kb (password: crackmes.de) Browse contents of crm1ninar1.zip The german secret service intercepted an email to an espionage team.
Difficulty: 2 - Needs a little brain (or luck) | RatingVotes: 6 View profile of _ninar1_ » |
Solutions
Solution by main, published 07. nov, 2008; download (1581 kb), password: crackmes.de or browse.
main has rated this crackme as quite nice.
Discussion and comments
| nkcss 02. Nov 2008 | I'm kind of stuck, I found out that the sum of the numeric values of the first 4 characters (\r\n are countede if less then 4 chars are inputted) that you input have to hadd up to 0x129. After that, I saw a jump and a compare eax to 'O', but got lost there. The program doesn't say 'wrong user', but nothing is outputted. My input: ZkW Any pointers are appreciated. |
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| main 02. Nov 2008 | I´ve solved it now. In my solution I have 4 chars anyway. There are a xoring with 4 predefined dwords, look for that and keep the xor in mind then you´ll solve it. And keep the endians in mind! :) |
| main 02. Nov 2008 | Sorry, I must´ve been drunk when I wrote that above :) Of course, there are 3 names and they decrypt dwords that correspond to the entire message. I got 2 of 3 now, but soon I´ll have the third. |
| main 02. Nov 2008 | Now I´ve found the third name :) |
| main 02. Nov 2008 | But this one does not take 10 min. It takes at least 20 mins I think, if you don´t already know what to look for of course. |
| user2k 02. Nov 2008 | the bomb will kaboom in 2009 so u got more time than 15 minutes :) |
| main 02. Nov 2008 | Hehe, dull germans. Probably the girls fault :) I´m working on solution, but the problem is I´m looking for a nice function to convert dword to string. PBYTE does it for now, but there should be nicer solutions to this. Do you know any such function? I don´t like ugly code... :) |
| main 02. Nov 2008 | Hmm, It seems that printf("%s", (char*)&a_dword) does the work too :) |
| user2k 10. Nov 2008 | main: if string is above or equal 4 bytes u cant use ptr to dword because of 0x00 at end. printf never ends printing a nonended string. btw nice solution |
| main 12. Nov 2008 | Yes, that is correct. That is why i added the terminatng character in my solution. Bu anyway, is there a better way to this (print dwords)? Thanks! |
| ~misunderstood~ 13. Nov 2008 | @_ninar1_ nice one, I liked the "little story" behind it a lot..it took me about 40 minutes to solve it ;) |
| itsho 13. Nov 2008 | @main: love you solution !. thank you. @_nirar1: how come you file is so so small ? did you actually wrote the whole thing in ASM ? |
| main 14. Nov 2008 | @itsho: Thanks! Keep on coding! :) |
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