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In this paper, the problem of secret key agreement in state-dependentmultiple access channels with an eavesdropper is studied. For this model, thechannel state information is non-causally available at the transmitters;furthermore, a legitimate receiver observes a degraded version of the channelstate information. The transmitters can partially cooperate with each otherusing a conferencing link with a limited rate. In addition, a backward publicchannel is assumed between the terminals. The problem of secret key sharingconsists of two rounds. In the first round, the transmitters wish to share acommon key with the legitimate receiver. Lower and upper bounds on the commonkey capacity are established. In a special case, the capacity of the common keyis obtained. In the second round, the legitimate receiver agrees on twoindependent private keys with the corresponding transmitters using the publicchannel. Inner and outer bounds on the private key capacity region arecharacterized. In a special case, the inner bound coincides with the outerbound. We provide some examples to illustrate our results.

Secret Key Agreement Using Conferencing in State- Dependent Multiple Access Channels with An Eavesdropper