Archive for December, 2009

Jam Resistant Communication Without a Shared Key

December 7th, 2009 4 comments

BBC Decoding TreeSome US Air Force Academy (USAFA) and National Security Agency (NSA) smart guys (Baird, Bahn, and Collins – BBC) have come up with a way to achieve the kind of jam resistance that shared keys provide (like spread spectrum) but without the need for a shared key. For the crypto guys out there, this would be analogous to what the Diffie-Hellman key exchange brought to the world of symmetric cryptography. In fact one would probably use such a key exchange over BBC and then revert to traditional jam-resistant communication techniques, just as we do with asymmetric/symmetric crypto. Their ideas extend beyond jam resistance, but that’s what we’ll look at here.

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