Skeptic,

It's funny that the topic has wandered off into crypto. Just a few days ago I posted a program to codeproject demonstrating how simple it is to force a specific CRC in a file. One often sees it stated that CRC's shouldn't be used for message digest apps but a lot of people seem to think they are candidates and a lot of crypto tyros fall in love with them. It's also applicable to error correcting codes, an area I've been intrigued by for decades.

-Marty