There's a couple of browser plugins that do this, with a password, so long as someone else knows the password it will decode. I'm not near my machine that has i

There's a couple of browser plugins that do this, with a password, so long as someone else knows the password it will decode. I'm not near my machine that has it, but I know it does Korean, japanese, and Chinese characters - you choose which set you want. And it doesn't back-translate to anything useful, it's just encoding.