iCloud Keychain lets you generate, store, and manage strong, unique passwords between your iPhone, iPad, and/or Mac. In theory, that's an amazing win for both convenience and security. Unfortunately, it's only in theory. Sadly there are two big problems with iCloud Keychain, one conceptual, one architectural, that make it so that I — and anyone concerned with security — can't use it. Luckily, it's something that can and hopefully will be fixed with iOS 8 and OS X 10.10.