By Pavol Cerven
Nutshell evaluation - The ebook covers the fundamentals of defending software program and covers a few safety instruments. notwithstanding, the realm has too many safeguard recommendations and schemes and evolves too quickly for one ebook to do all of it. Will date speedy.
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Additional info for Crackproof Your Software: Protect Your Software Against Crackers (With CD-ROM)
Eventually the calculation result is XORed with the actual date, which means that the code is different every day. DLL and the correct decoding key. It is difficult to stop the running program in this small decoding routine. Tracing is out of the question because it was started by creating a new thread, and 36 the second part of the EXE calls it with Resume Thread API calls. One way to get into it, though, is to change the first instruction at the beginning to INT 3h, set a breakpoint in SoftICE at INT 3h, run the program, and then, once the program stops at the breakpoint, replace the INT 3h with the original value.
Still, it's easy enough to find software emulators for the most common hardware keys that try to emulate the key's presence. It is very important when using a hardware key to manage the protection in the program code itself, and not to rely on drivers or API calls from the manufacturer. Crackers often know these drivers and API calls very well, and they don't have much of a problem overcoming them. When a cracker can't find a suitable emulator for a particular key type, he will try to emulate its behavior directly in the program code.
You can easily find each API call for the hardware key service simply by looking for this test. The protection essentials are the same as for HASP, and it is again necessary to prevent emulation in the program memory. 32 Chapter 4: CD Protection Tricks Overview CD−checking software protection is used by almost all programs distributed on CD. The products in this category range from very simple defenses (that aren't real protection against crackers at all) to highly sophisticated protective software.
Crackproof Your Software: Protect Your Software Against Crackers (With CD-ROM) by Pavol Cerven