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Ripping algorithms from copy protection products is often an easy and effective method for creating keygen programs. The idea is quite simple: Locate the function or functions within the protected program that calculate a valid serial number, and port them into your keygen. The beauty of this approach is that you just don t need to really understand the algorithm; you simply need to locate it and find a way to call it from your own program. The initial task you must perform is to locate the key-generation algorithm within the crackme. There are many ways to do this, but one the rarely fails is to look for the code that reads the contents of the two edit boxes into which you re typing the username and serial number. Assuming that KeygenMe-3 s main screen is a dialog box (and this can easily be verified by looking for one of the dialog box creation APIs in the program s initialization code), it is likely that the program would use GetDlgItemText or that it would send the edit box a WM_GETTEXT message. Working under the assumption that it s GetDlg ItemText you re after, you can go back to the Names window in OllyDbg and look for references to GetDlgItemTextA or GetDlgItemTextW. As expected, you will find that the program is calling GetDlgItemTextA, and in opening the Find References to Import window, you find two calls into the API (not counting the direct JMP, which is the import address table entry).

C[uk , ul ]

004012B1 004012B3 004012B8 004012BA 004012BD 004012C2 004012C5 004012C7 004012C9 004012CE 004012D0 PUSH 40 PUSH Key4.0040303F PUSH 6A PUSH DWORD PTR [EBP+8] CALL <JMP.&USER32.GetDlgItemTextA> CMP EAX,0 JE SHORT Key4.004012DF PUSH 40 PUSH Key4.0040313F PUSH 6B PUSH DWORD PTR [EBP+8] ; ; ; ; ; Count = 40 (64.) Buffer = Key4.0040303F ControlID = 6A (106.) hWnd GetDlgItemTextA

; ; ; ;

Reach to reach gybing is about getting the boat going as fast as possible in the new direction as quickly as possible. On a windy day it may be safer to do a run to run gybe, and then head up when ready! For both tacks and gybes the rst part of the movement tends to be slightly slower and smooth, so use the boat speed that you have, followed by a transition where the

E[ M i ]

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Listing 11.1 Conversion algorithm for first input field in KeygenMe-3. (continued)

11

C[ M i , M j ]

CALL <JMP.&USER32.GetDlgItemTextA> CMP EAX,0 JE SHORT Key4.004012DF JMP SHORT Key4.004012F6 PUSH 0 PUSH Key4.0040348C PUSH Key4.00403000

j E[ M j ]

004012EB 004012ED 004012F2 004012F3 004012F6 004012FB 00401300 00401302 00401304 00401306 0040130B 00401311 00401318 0040131A 0040131D 0040131F 00401321 00401327 00401329 0040132B 00401330 00401331 00401333 00401334 00401339 0040133E 0040133F

Bear away to allow the crew to get the boat from hiking/ trapeze (single handed hiking boats put front foot on top of toe strap)

PUSH 0 CALL <JMP.&USER32.MessageBoxA> LEAVE RET 10 PUSH Key4.0040303F CALL <JMP.&KERNEL32.lstrlenA> XOR ESI,ESI XOR EBX,EBX MOV ECX,EAX MOV EAX,1 MOV EBX,DWORD PTR [40303F] MOVSX EDX,BYTE PTR [EAX+40351F] SUB EBX,EDX IMUL EBX,EDX MOV ESI,EBX SUB EBX,EAX ADD EBX,4353543 ADD ESI,EBX XOR ESI,EDX MOV EAX,4 DEC ECX JNZ SHORT Key4.0040130B PUSH ESI PUSH Key4.0040313F CALL Key4.00401388 POP ESI CMP EAX,ESI

(19.20)

; Style = MB_OK|MB_APPLMODAL ; Title = KeygenMe #3 ; Text = Please Fill In 1 Char to Continue!! ; hOwner = NULL ; MessageBoxA

Listing 11.1 (continued)

In this expression C[ M i , M j ] is the covariance of the material properties between two elements. Baecher and Ingra found that, for elements that are widely spaced with respect to the correlation distance, the covariance at element centroids can be used as an approximation. For more closely spaced elements, two approximations are suggested: C[ M i , M j ] V [M]R( ) C[ M i , M j ] V [ M ]R( ) (19.21)

Before attempting to rip the conversion algorithm from the preceding code, let s also take a look at the function at Key4.00401388, which is apparently a part of the algorithm.

Turn boat so sails fill on 3 new side. Get ready to hike/trapeze. It may help to sheet in slightly so as to gybe sooner and when you are ready.

00401388 00401389 0040138B PUSH EBP MOV EBP,ESP PUSH DWORD PTR [EBP+8]

R( ) is the distance between centroids. The rst applies when the autocorrelation function is approximately linear between points in two elements, and the second when it is not. Baecher and Ingra observed, Two-dimensional settlement uncertainties depend on uncertainties in the properties of all the elements through the uk / M i terms. Correlation is introduced among nodal displacements due to the common dependence on the realizations of particular random variables. This correlation would exist even if the element properties themselves were mutually independent. They introduced a further simpli cation by assuming that Poisson s ratio is deterministic so that the uncertain Young s modulus can be factored out of the element stiffnesses. Consequently the term at row s and column t of the stiffness matrix, to which w elements contribute, becomes

Listing 11.2 Conversion algorithm for second input field in KeygenMe-3.

(19.21)

0040138E 00401393 00401394 00401396 00401398 0040139B 0040139C 0040139E 0040139F 004013A2 004013A3 004013A5 004013A8 004013AA 004013AC 004013AD 004013AF 004013B1 004013B2 004013B3

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