note 50227 deleted from function.microtime by tularis

Note Submitter: yonman at nsa dot co dot il ---- md5 time stamps can be further hardened by appending a "secret predefined key" (i.e, one that is stored in a hardened position ... a sort of poor man's bi-directional encryption key) after the timestamp, before passed into the md5 function. a 40-characters long key can seriously hinder the brute force attack described above. Wouldn't use this method for anything really important though ... unless backed up by more layers for defense.