  We study a deterministic approximation of the two-user multiple access
wiretap channel. This approximation enables results beyond the recently shown
$\tfrac{2}{3}$ secure degrees of freedom (s.d.o.f.) for the Gaussian multiple
access channel. While the s.d.o.f. were obtained by real interference
alignment, our approach uses signal-scale alignment. We show an achievable
scheme which is independent of the rationality of the channel gains. Moreover,
our result can differentiate between channel strengths, in particular between
both users, and establishes a secrecy rate dependent on this difference. We can
show that the resulting achievable secrecy rate tends to the s.d.o.f. for
vanishing channel gain differences. Moreover, we extend the s.d.o.f. bound
towards a general bound for varying channel strengths and show that our
achievable scheme reaches the bound for certain channel gain parameters. We
believe that our analysis is the first step towards a constant-gap analysis of
the Gaussian multiple access wiretap channel.
