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    <p>Interesting problem.</p> <p>Generally speaking the purpose of storing data locally is so that it can be accessed while "offline".</p> <p>However, I think there may be some underlying misconceptions here. Presumably the only reason you'd want to do this is to try and prevent a stolen device from giving up it's secrets. Fact of the matter is, you can't. If the device is no longer under your physical control then it's just a matter of time before it can be hacked.</p> <p>If we are talking about sensitive data, it shouldn't be stored on the devices. Instead the device should retrieve the data it needs from your server when it needs it and delete it locally when no longer necessary.</p> <p>The fact that you want the device to only work when connected to your local network implies that you can accomplish this goal.</p> <p>As a side note, this is why things such as "remote wipe" exist. It's also why every time the device connects to your network it needs to test it's authentication and authorization. Point is if someone reports the device lost or stolen then you need to be able to ban it from your network AND, if the device supports this, remotely disable it. </p> <p>Bearing in mind that it is entirely possible to pull a device from the network and therefore disable a remote wipe from executing.</p> <hr> <p>With that out of the way, there is absolutely no way you can ensure the device is on a given network. All of that can be faked. It's kind of trivial to setup a router of a given name and change it's MAC to masquerade as whatever, and assign it certain IP addresses. For all intents and purposes it could be made to look exactly like an access point you have... And that's just with normal run of the mill wireless routers you can buy at your local computer store.</p>
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    1. POHow to uniquely identify a network?
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    1. POHow to uniquely identify a network?
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    1. COAgree with the misconception fact. If the point of the local data is that it can be accessed while offline, trying to identify the network is pointless...
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    2. COThanks for the "remote wipe", I will take a look at that too.
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