On a side note: You can use such crafted strings as a black box testing tool to verify if a site does infact use md5 or other weak algorithms to store the passw

On a side note: You can use such crafted strings as a black box testing tool to verify if a site does infact use md5 or other weak algorithms to store the passwords. This can perhaps be used in conjunction with other factors to craft an attack. As a corrollary this can also be used as a testing tool by anyone for any third party site to determine known vulenrablities in their password storage