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View Full Version : How to crack this task?


mitrix
May 20th, 2001, 20:34
im a newbie cracker,im learning Harlenquin's
course in his homepage
http://htasks.cjb.net/fx23ht.zip
and download Task2/3.
In the programer the DD [0040209F] is 00401124
and the [00401124] is E8 .i think it shoud EB.

:00401124 E8B5000000 Call 004011DE
:00401129 83F80A cmp eax, 0000000A
:0040112C 757B jne 004011A9
:0040112E BAA7204000 mov edx, 004020A7
:00401133 33DB xor ebx, ebx \
:00401135 8A1A mov bl, byte ptr [edx] |
:00401137 42 inc edx |
:00401138 33C0 xor eax, eax \the first serials must 4
:0040113A 8B0D9F204000 mov ecx, dword ptr [0040209F] /
:00401140 8A01 mov al, byte ptr [ecx] |
:00401142 80F3DC xor bl, DC |
:00401145 3AD8 cmp bl, al /
:00401147 7560 jne 004011A9
:00401149 8A02 mov al, byte ptr [edx]
:0040114B 42 inc edx
:0040114C 3430 xor al, 30
:0040114E C1E008 shl eax, 08
:00401151 8A02 mov al, byte ptr [edx]
:00401153 42 inc edx
:00401154 3430 xor al, 30
:00401156 C0E004 shl al, 04
:00401159 66C1E804 shr ax, 04
:0040115D 8A1A mov bl, byte ptr [edx]
:0040115F 42 inc edx
:00401160 2AC3 sub al, bl
:00401162 3C3C cmp al, 3C
:00401164 7543 jne 004011A9
:00401166 B104 mov cl, 04

* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00401178(C)
|
:00401168 8A02 mov al, byte ptr [edx]
:0040116A 42 inc edx
:0040116B 3433 xor al, 33
:0040116D 2C03 sub al, 03
:0040116F 3AC1 cmp al, cl
:00401171 7536 jne 004011A9
:00401173 FEC9 dec cl
:00401175 80F900 cmp cl, 00
:00401178 75EE jne 00401168
:0040117A 668B02 mov ax, word ptr [edx]
:0040117D 663D3033 cmp ax, 3330
:00401181 7526 jne 004011A9
:00401183 A0A7204000 mov al, byte ptr [004020A7]
:00401188 3C37 cmp al, 37 ; the first serials must 7
:0040118A 751D jne 004011A9
:0040118C 6A00 push 00000000


if what i think is wrong,please tell me some ideal about crack it.
thinks!

Kayaker
May 21st, 2001, 00:01
Hi Mitrix,

I took a look at this and, as a matter of fact, liked it so much I hope you'll forgive me if I move it to the Mini Project Forum. I think it'll make a great project and there's some interesting instruction to come out of it.

I've locked this thread in the Newbies Forum, please post all replies to the Mini Project Forum.

Regards,
Kayaker