mausy131's Cypher Code
| Download Crackme_by_mausy131.zip, 262 kb (password: crackmes.de) Browse contents of Crackme_by_mausy131.zip Hello,
Difficulty: 1 - Very easy, for newbies | RatingWaiting for at least 3 votes View profile of mausy131 » |
Solutions
Solution by iSSoGoo, published 05. mar, 2013; download (9 kb), password: crackmes.de or browse.
iSSoGoo has not rated this crackme yet.
Discussion and comments
| mausy131 Author 05. Mar 2013 | Very good solution iSSoGoo :) |
|---|---|
| iSSoGoo 05. Mar 2013 | Thanks, it was fun ;) |
| mopy 16. Apr 2013 | !!! WARNING !!! THIS IS A VIRUS! https://www.virustotal.com/en/file/9dbc1de700a488e791f2a77e019ecbc02d9e8e41b9beb4f4655382aaf5910d15/analysis/1366120997/ |
| iSSoGoo 16. Apr 2013 | Very interesting, I just testet it myself and compiled some programs (Simple 'Hello World') under different systems (Win7 and XP) and get Virus Detections, too! I think there is a problem with the GNU GCC Compiler. Look at that: https://www.virustotal.com/en/file/9dbc1de700a488e791f2a77e019ecbc02d9e8e41b9beb4f4655382aaf5910d15/analysis/1366120997/ I get 6 detections, for a simple Hello World program :P |
| mausy131 Author 17. Apr 2013 | I know virustotal detected it as a "virus" or "malware". If you don't trust me then don't download this crackme. Trust me, it is not malware! The most of the AV's recognize it a "Gen" and since it is a keygenme they are right, but this is 100% a false positive! |
| tong 12. May 2013 | if crakeme shows a string with 'a' or 'A'，there is no key.The crakeme Algorithm should be ">= 'n'". |
| iSSoGoo 12. May 2013 | @tong: Very Good! I didn't see that, but you're absolutely right! |
| mausy131 Author 17. May 2013 | I used if ((tolower(source[i]) - 'a') < 14) So it should be < 13 I guess |
| mausy131 Author 27. May 2013 | I'm waiting for more solutions (: |
| elicn 11. Feb 2014 | Well, this is quite simple except from that 'bug' in the ROT13 implementation. Since ROT13 here is not reversible, i.e. ROT13(ROT13('n')) != 'n' and ROT13(ROT13('N')) != 'N', there is no way to generate a valid key for a username that contains either 'a' or 'A'. That is a classic 'off-by-one' bug. |
| elicn 11. Feb 2014 | Sorry, I meant ROT13(ROT13('a')) and ROT13(ROT13('A')) up there. |
| mausy131 Author 30. May 2014 | That's right, sorry for that bug :( |
You may leave your comment, thoughts and discuss this crackme with other reversers here.
Acting childish will not be tolerated.
HTML and such will be left as-is, so don't try.