With the continuous development of processor technology, the 64-bit operating system came out. Later on, the 64-bit applications began to spread widely too. In the field of reverse engineering (i.e.: software cracking), the classic and traditional OllyDbg can only perform reverse analysis on 32-bit applications. At this time, you need to know there is another debugging software that specially designed for analyzing both 32-bit and 64-bit programs - x64dbg.

PEiD (short for PE iDentifier) is a well-known professional packer/cryptor/compiler detecting tool. It's so powerful that it can detect the types/signatures of almost any PE file packing tools (at present, the number has been more than 600 kinds). In addition to the official version, AppNee also provides you its full-plugin version, which can be treated as the most perfect one version (contains 60+ plugins and necessary runtime library files: mfc70.dll, msvcr70.dll, rtl70.bpl, vcl70.bpl) on the Internet at present. I do believe reverse engineers or software cracking/unpacking enthusiasts must like it very much.

OllyDbg is a professional 32-bit assembler-level analyzing debugger from Germany, written for both Windows 32-bit and 64-bit, released and kept as freeware. As is known to all, it is really an edge tool for software cracking, and a must-have tool for many novices.