When you're typing a password on the ipad, it does hide most of the letters, but the last letter that you type is always clearly visible. There should be an option added to the iOS to make it so that every letter is hidden, even as you are typing them. It is very easy for bystanders to just look over your shoulder and discover your pin or password, simply by looking at the end of the line as you are typing. This is a huge flaw of security.