Num of possible   Times better   Times better
                      hashes            than CRC32     md5_hex
===================   ===============   ============   ============
CRC32                          4.3E09
MD5 (19 of base 16)            7.6E22         1.8E13
MD5 (19 of base 62)            1.1E34         6.5E20         1.5E11