Cracking Projects For Newbies

EAX = 00 or 01 or FFFFFFFF Saturday, 06-Feb-99 20:48:15 206.248.47.105 writes: Hello Sandman I checked out the serial Checking without any input in either name or code box. Yes interesting. I also noticed that eax returned FFFFFFFF instead of 01 Actually eax will be be FFFFFFFF every time [esp+10] has a value less than [esp+14] For example [esp+10] has a "9" (39h) and [esp+14] has an "A" (41h) then the carry flag will be set and eax = FFFFFFFF For example [esp+10] has a "A" (41h) and [esp+14] has an "9" (39h) then the carry flag will not be set and eax = 01 0040CCFA 1BC0 sbb eax, eax < == if carry flag is set eax becomes FFFFFFFF (0 - 1= FFFFFFFF) :0040CCFC 5E pop esi :0040CCFD 83D8FF sbb eax, FFFFFFFF < == carry flag still set (FFFFFFFF - FFFFFFFF = 0 - 1 = FFFFFFFF :0040CD00 5B pop ebx :0040CD01 83C404 add esp, 00000004 :0040CD04 C3 ret So eax can return two values of non-zero either FFFFFFFF or 01, (both will bring us to sorry screen) And ofcourse 00 if our serial is correct Princess Princess

Message thread:

Princess: Princess' tread Project 6 (03-Feb-99 18:51:42)

Princess: Re: Project 6 Task 2 (04-Feb-99 16:04:40)

The Sandman: Re: Re: Project 6 Task 2 (04-Feb-99 17:36:06)

Tuffluck: Re: Re: Re: Project 6 Task 2 (05-Feb-99 09:02:49)

Kali: Why can't you get the extra cards? (04-Feb-99 19:24:21)

Re: Why can't you get the extra cards? (04-Feb-99 19:46:14)

HarvestR: Re: Re: Why can't you get the extra cards? (04-Feb-99 20:11:37)

Princess: Re: Re: Re: Why can't you get the extra cards? (04-Feb-99 21:32:13)

HarvestR: patching it in 2 different places (05-Feb-99 16:01:57)

Princess: Task 3, Q. 2 and 3 calculation and compare (06-Feb-99 12:47:45)

Princess: Task 3, Q. 1 (06-Feb-99 16:51:54)

The Sandman: Re: Task 3, Q. 1 (06-Feb-99 18:57:09)

Princess: EAX = 00 or 01 or FFFFFFFF (06-Feb-99 20:48:15)

Jeff: Re: EAX = 00 or 01 or FFFFFFFF (06-Feb-99 21:01:36)

Kali: Amazing!!! (07-Feb-99 19:26:30)

the snake: Re: WELLDONE (07-Feb-99 01:02:08)
HarvestR: Re: Task 3, Q.3 more explanations ? (11-Feb-99 10:46:41)

Re: Princess' tread Project 6 (07-Feb-99 18:37:37)

Princess: Re: Re: Princess' tread Project 6 (07-Feb-99 18:44:37)

jeff: Re: WiNExPose' (07-Feb-99 18:59:24)

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