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A two-transmitter Gaussian multiple access wiretap channel with multipleantennas at each of the nodes is investigated. The channel matrices at thelegitimate terminals are fixed and revealed to all the terminals, whereas thechannel matrix of the eavesdropper is arbitrarily varying and only known to theeavesdropper. The secrecy degrees of freedom (s.d.o.f.) region under a strongsecrecy constraint is characterized. A transmission scheme that orthogonalizesthe transmit signals of the two users at the intended receiver and uses asingle-user wiretap code is shown to be sufficient to achieve the s.d.o.f.region. The converse involves establishing an upper bound on aweighted-sum-rate expression. This is accomplished by using induction, where ateach step one combines the secrecy and multiple-access constraints associatedwith an adversary eavesdropping a carefully selected group of sub-channels.

MIMO Multiple Access Channel with an Arbitrarily Varying Eavesdropper