How to safely charge your apple device at a charging station?

Question

Recently there has been alot of news about how free charging stations could be reading data from devices that are plugged into them. The obvious solution to this issue is to place an adaptor between the charging station and the device that is only wired to transmit power.

I would sugest that the ideal design of would be a USB micro female to Apple dock male connector. This could be small enough to be carried around in a wallet and as USB micro is the current device charging standard compatability would be good.

This would also have an impact for non Apple devices where a USB micro passthrough addaptor could be used.

Does anyone know of any such device on the market?

This article is the inspiration behind my question.