What the hell are you quoting that for? Getting a bit too warm is it?
Your OP won't save you. Only code, you got any?
Shadow's encrypted messaging system was coded by their devs, and since being open sourced is being used by StealthCoin, DarkShibe, Boomcoin, Gnosis, XCash...It's all there on GitHub for anyone interested in facts. If you're here to just parrot the fudsters, then sorry if the facts make that more difficult for you. But if you're actually interested in real development then hopefully my answer's been useful to you.