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[keygen.me] crypto 4 newbies #1


zuma555

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Hello everyone, sorry for the loooooooonnngg awayyyyyyyyyyyyyyyyyyyyyyyyy.... but you know university is f*ckd. Here goes another crackme from the heaven to hearth, this is an attempt for you to LEARN SOMETHING, its made for all the ones who are starting with crypto playground, if i wanted it to be hard it would be *HELL HARD*, so don't worry take it easy ;)

rules:

-no patching

-not any other rediculous solution, but an ellite stand-alone keygen+tutorial :)

cryptokg1.zip

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Hello everyone, sorry for the loooooooonnngg awayyyyyyyyyyyyyyyyyyyyyyyyy.... but you know university is f*ckd. Here goes another crackme from the heaven to hearth, this is an attempt for you to LEARN SOMETHING, its made for all the ones who are starting with crypto playground, if i wanted it to be hard it would be *HELL HARD*, so don't worry take it easy ;)

rules:

-no patching

-not any other rediculous solution, but an ellite stand-alone keygen+tutorial :)

Hey

Everytime I want to test a key it fails. Is this a part of the protection or just a coding problem ?

Greetz Zer0Flag

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after a litle analisys you will find that the crash is part of the keygen, you can avoid it ofc. And there is another problem to all: i

forgot to clear buffers, so each time you wish to try a new serial please restart the application.

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If the serial no tire then there are the errors

also

here2:

mov bl, byte ptr [serial+ecx]

cmp bl,2Dh

je here

inc ecx

jnz here2

here:

:) sorry bad english

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yep =) com on guys this is very easy can't anyone solve it.... it was supposed to be easy LOL. Do you think that a valid serial will help you?

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I saw that in my computer ebx = 0x130 and edx = 0x168... your ascii values are different than mine or your exe file is modified.

Edited by zuma555
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**** i think my crackme has a HUGEEEE bug... when username is getting hashed...

0040119A |. 8BD0 MOV EDX,EAX

0040119C |. BB 00000000 MOV EBX,0 ;WHAT IS ECX VALUE HERE????

004011A1 |> 0283 E8324000 /ADD AL,BYTE PTR DS:[EBX+4032E8]

004011A7 |. 03C1 |ADD EAX,ECX ; kernel32.7C80BDF6

004011A9 |. 0FAFC2 |IMUL EAX,EDX

004011AC |. 03C0 |ADD EAX,EAX

004011AE |. 43 |INC EBX

004011AF |. 4A |DEC EDX

004011B0 |.^ 75 EF \JNZ SHORT cryptokg.004011A1

please answer me as fast as you can...

Edited by zuma555
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