downloadbrowseGanoes Paran's Ganoes - First Crackme

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Hiya! Ganoes here. and this is my first crackme.

Rules are simple. username can be anything: numeric, alphabetical, special, doesn't matter

Password is numbers only.

No brute forcing
No Self-Keygenning
No Patching.

Completion Levels:

Gold: Same as Silver but you need to make a keygen

Silver: Same as Bronze but also figure out the algorithm used to make password

Bronze: Get the password for your username

Shouldn't be too hard, hope you enjoy!

Difficulty: 2 - Needs a little brain (or luck)
Platform: Windows
Language: C/C++

Published: 05. Jun, 2009
Downloads: 527


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Solution by fireblast, published 12. jun, 2009; download (4 kb), password: or browse.

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Discussion and comments

05. Jun 2009
solved but a little bug found, when you add the sums you do one addition out of memory I think you do something like

hashes[i+1] += hashes[i];

you have to do something like

hashes[i+1] += hashes[i];
Ganoes Paran
05. Jun 2009
yea, was a tad buggy i think, i dunno, was my first crackme afterall :P

this was, more or less,a little test run to see if i can make a stable crackme. over the past few days i made another one, significantly harder then this. you ight be interested in trying it out =)
08. Jun 2009
Good little crackme :) .

freesoul, from the assembly, it looks more like :
for (i = 1; i < strlen(name); i++)
serial[i] += serial[i-1];

Anyway, you ought to put some more bound checking. Anyway, theere seem to be a buffer overflow which only affects the password (if you input a huge username, you overwrite the password memory and bypass the password entry).
I might be wrong but it is how I see it ;) .
Ganoes Paran
08. Jun 2009
Yes this is true. I only used a standard array to hold 256 members, you break and it'll go past.

but then again, i wasn't expecting someone to have a name that big :P

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