Pretty interesting! The tool they use is CRC RevEng - apparently one of the things it does it try known CRCs, and they give this unique catalog of known CRCs:

Pretty interesting! The tool they use is CRC RevEng - apparently one of the things it does it try known CRCs, and they give this unique catalog of known CRCs: http://reveng.sourceforge.net/crc-catalogue/ http://reveng.sourceforge.net/crc-catalogue/