Dead Letter Drops and Geo Caches
For Whistleblowers, unlike a Spy or Secret Agent, the use of Dead Drops / Dead Letter Drops or Caches, is unlikely to be a regular occurrence, and may only need to be used once, in order to pass on some actual physical evidence which supports a whistlelblower's claims.
However, pretty much the same precautions apply, both in choosing an appropriate location for the drop, signaling when and where there is something to be picked up, and taking anti-forensic precautions, in case the physical package is lost or intercepted, whilst preserving it from damage by the weather or even by wild animals etc.
You may be able to disguise your real "whistleblower" Dead Drop activity if it is near an "innocent" GeoCache site.
- Wikipedia article on Dead Drops / Dead Letter Drops etc.
- Wikipedia article on Geo Caching
- Magnetic Geo Cache tips
With a magnetic nano cache you can really have some fun when deciding on where to put it. It obviously needs something ferrous to stick to and because of its magnet, you can put it in places where regular cache container wouldn't be suitable.
Try placing the cache underneath something such as a park bench or bridge support. You can be as devious as you want - placing it under the bottom step on a metal stairway means that no-one will be able to see it unless they get down on their hands and knees to do so.
Nano caches are ideally suited for built up areas or urban-caching where you can find more places to site the magentic cache than in the countryside.
Here are some ideas for you:
* Under a park bench.
* Under some steps.
* Under a bridge.
* Attach it to some railings.
* On a fence post.
Remember that just because it's magnetic doesn't mean you can't put it a hidey hole somewhere.
Make sure that you don't place it where workmen will find it. Trust me if a BT engineer comes to look into one of their boxes he will immediately spot anything out of place on it and you risk losing the cache. The cache should be placed out of the way.
As with Postal or Courier sent messages, you might also need to take precautions against leaving characteristic DNA, fingerprint, fibre , particle etc. on the Container or the actual message itself.
Caches or Dead Drops outside, exposed to the weather, will probably involve metal or plastic etc. waterproofing, which usually retains fingerprints and DNA samples etc. quite well.
Anything sticky e.g. tape or adhesive used to weatherproof or attach the container to something, could also trap fibres, dust particles, hair, skin cells etc.
Signals about Caches or Dead Drops
See the section on Covert Channel Signals for Meetings or Dead Letter Drops for some ideas about Covert Channel Signals,
There may need to be different signals to signal that there is something at the Dead Drop to be picked up, that the Dead Drop is suspected of being under surveillance, and that an alternative Dead Drop should be used instead, or that an urgent Physical Meeting is needed..
In spy fiction and in real life espionage cases, such signals usually involve something inconspicuous, which the other person can notice without stopping and reading a note e.g. a window with curtains, a venetian blind or a light switched on or off, a chalk mark, or thumb tack on the pavement or on a bit of street furniture like a litter bin or telegraph pole etc.
The internet provides a lot of alternative methods of sending or receiving a Covert Channel signal.