With so much fraud and problems with security on the internet, it’s sometimes hard to know if a file you download on the internet is what you think it is or not. Fortunately, you have a way of taking a “fingerprint” of any file you wish to post, and likewise a way of verifying any file you download against that same “fingerprint”. The instructions I give for this tutorial (and every tutorial I’ll do) will be for the Mac, but most everything I show will be able to be done in any *nix OS. Sorry Windows users. (more…)