I did some searches of Macrumors and didn't find what I was looking for. So here's my problem: I've had some experience in coding with 6 or so apps on the Mac and iOS stores, but from what I know this is a tough subject. I am looking for a good tutorial about login security and how an iOS app can use a login/pw combo to connect to my online server, send my server data, and have that data stored for future use. I have had different people say different things. "Oh just look up such-and-such security algorithm and do it yourself." to "Bad security can lead to stolen passwords / accounts not just on your server but on the user's other online logins also. Do NOT try it by yourself." I am storing achievement data for an educational quiz / game type site. The data is not critical, but it would be nice if nothing too bad happened. Thanks, Macrumors!