Yeah... it's difficult enough to find engaging conversations with people I do know. If you want to talk for the sake of talking, there won't be a shortage of possibilities. And if you are sociable enough, people will do so.
But outside of these parameters? It's very slim picking.
I know what ECDSA is and if you brought it up in a random conversation unprompted I'd try to find your spaceship so I could escape the conversation on it.