yonkie's Yonkie's crackme#2
| Download yonkie_crackme.zip, 26 kb (password: crackmes.de) Browse contents of yonkie_crackme.zip Inside of archive, there're two valid keys. Each key contain customer's name, serial number and hypothetical features options.
Difficulty: 3 - Getting harder | RatingWaiting for at least 3 votes View profile of yonkie » |
Solutions
Solution by morecode, published 21. apr, 2015; download (258 kb), password: crackmes.de or browse.
morecode has not rated this crackme yet.
Discussion and comments
| BUBlic 10. Jun 2007 | Is the long encryption (seems symmetric) a custom one or is it some standard like rijndael (with *randomly* created constant tables)? |
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| jB_ 12. Jun 2007 | Rather nice crackme, but totally over rated. |
| HMX0101 14. Jun 2007 | I really liked it!, this was my second attempt at Rijndael (my first one was l0calh0st one ;)... probably i will write a tute... but its possible to get first condition (sum of first 12 chars) without brute it? :/ |
| jB_ 15. Jun 2007 | You have to bruteforce. It should be very fast. Personally I increase the serial number, entered in the keygen, when there is no way to find a license for a given serial. |
| HMX0101 15. Jun 2007 | Oh, so i do the right :) I randomized serial number in order to get first condition right, and put some checkboxes to select which features do you want :D Thanx for this one, yonkie! As jB said is a nice crackme :) |
| yonkie Author 15. Jun 2007 | You are right in part. But it is possible to generate a key for any specific SN: # License file for Yonkie's CrackMe#2 # Licensed name HMX0101 # feature flags 00000FFF # serial number DEADC0DE N=HMX0101 K=E20D665268FFF5F44AF46E22819706C5 # License file for Yonkie's CrackMe#2 # Licensed name HMX0101 # feature flags 0000FFFF # serial number DEADC0DE N=HMX0101 K=93BD1019F43766907A4A453BDB2804DE Give me any name, SN, 16 features flags and I'll present a key for it. |
| HMX0101 15. Jun 2007 | How it can be maked if sum of 12 chars must be equal to two last chars? exists a trick? :/ |
| yonkie Author 15. Jun 2007 | Yes, a trick :) |
| HMX0101 15. Jun 2007 | damn, what i've missed?, jB missed it too? :/ i've no idea, you can reveal that trick :D |
| jB_ 15. Jun 2007 | Yup my keygen was buggy because of the size of one parameter (16 bits instead of 32 bits). yonkie is right. |
| redoC 21. Mar 2014 | # License file for Yonkie's CrackMe#2 # Licensed name redoC # feature flags 00001234 # serial number 11111111 N=redoC K=249929E370D54FBB387EF002A03805C0 too easy, difficulty 2 |
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