- #Hopper disassembler license key algorithm how to#
- #Hopper disassembler license key algorithm serial key#
- #Hopper disassembler license key algorithm serial number#
- #Hopper disassembler license key algorithm code#
#Hopper disassembler license key algorithm how to#
Fortunately, it's really easy to tell it how to interpret something. In particular, it doesn't identify Objective-C methods as code.
#Hopper disassembler license key algorithm code#
It makes some effort to pick out code and treat it as code, but doesn't get everything right. Fundamentally, some sections of the executable are code and some are data, but you can have Hopper interpret any part in any way. Hopper fundamentally treats all bytes in the executable equally. Tell Hopper to open the executable created from the above code, and it will load it and perform some preliminary analysis: These documents can be saved separately, preserving any comments or annotations you've added from one session to the next.Ĭlick Read Executable in the toolbar or select it from the File menu to get started. Hopper has a concept of documents separate from the binaries you inspect. When you first start Hopper, you get a blank document window. Last one I tried I gave up because it kept loading code over the code I was single-stepping through, and I'm sure it's gotten lots more complicated since then.// clang -framework Cocoa -fobjc-arc test.m #import M圜lass : NSObject I'm sure it's still similar, but they go through a lot of effort to hide the location of the call. Then it was just a matter of finding the right call and hardcoding the correct return value from that call.
Back then, the copy protection was usually writing to the disk and seeing if a subsequent read succeeded (If so, the copy protection failed because they used to burn part of the floppy with a laser so it couldn't be written to). Then you go back to the last "Call" that succeeded and step into it, then repeat. Computers are powerful, usually only takes a little while before it starts spitting out hits.Īs for hacking, I used to be able to step through programs at a high level and look for a point where it stopped working.
#Hopper disassembler license key algorithm serial number#
The serial number you can just extract the algorithm and start throwing "Guesses" at it and look for a positive response. If you want to know more, Google for the +ORC Cracking Tutorials they are very old and probably useless nowdays but will give you a good idea of what it means.Īnyway, a very good reason to know all this is if you want to write your own protection scheme. In essence it's something that requires a very deep knowledge, ingenuity and a lot of time! Oh, did I mention that is illegal in most countries? It is decrypted when loaded into memory but then they refuse to start if they detect that an in-memory debugger has started, Some heavily protected application have the code encrypted so that the file can't be disassembled. And you need to know the low level API of your Operating System. To create a keygen you have to understand the algorithm and write a program to re-do the exact same calculation (I remember an old version of MS Office whose serial had a very simple rule, the sum of the digit should have been a multiple of 7, so writing the keygen was rather trivial).īoth activities requires you to follow the execution of the application into a debugger and try to figure out what's happening. To create a crack you have to identify all the points where a check is done and modify the assembly code appropriately (often inverting a conditional jump or storing costants into memory locations).
#Hopper disassembler license key algorithm serial key#
Speaking just at a teoretical level the common way is to disassemble the program to crack and try to find where the key or the serialcode is checked.Įasier said than done since any serious protection scheme will check values in multiple places and also will derive critical information from the serial key for later use so that when you think you guessed it, the program will crash. Apart from being illegal, it's a very complex task.
0 kommentar(er)
