so the first and last couple of values of the shared secret string are exposed.. they don't get more exposed then that the more you chat, no? people will still have to try and guess the rest? 

so is the danger perhaps that the more you dm, the more you expose yourself in a database for being a target for breach? or is it something deeper?  

 @semisol maybe u noh? i try to do big brain here, need halp