I have been puzzled the past couple days about bluetooth low energy security.

**My situation:**

I am looking at what it might take to secure unpaired BLE connections. 

In some cases, and essentially this main use case, a mobile device (Android) may want to connect to several different peripherals randomly at different times throughout the day. By 'randomly' I mean I am walking by one if I have a dozen scattered around my apartment and I personally don't know exactly which one without physically checking. 

The process of physically accepting a pair request seems unnecessary and quite time consuming. I don't what to walk in the room the first time and have to manually pair each device, that would be insane if I had 100+ devices. Note that these devices don't necessarily have to be connected at the same time, but could. Also note that I understand this isn't generally the main use case of the typical peripheral to mobile communication considering the max connected devices at one time is 7. 

These peripheral devices have no I/O thus the `Numeric Comparison`, `Passkey Entry`, and `Out of Band`  connection methods don't seem to be the ones that I'm looking for. It seems that `Just Works` *should* work, however there doesn't seem to be security support for it. Anyone with a sniffer would be able to read all communication.

It seems I may be asking too much of Bluetooth LE and will have to figure out another means--maybe in the application layer?