We present two new achievable schemes for fading Gaussian multiple access wiretap channel (MAC-WT). Our schemes utilize the time varying nature of the channel model to align the interference from different users at the eavesdropper perfectly in a one-dimensional space while creating a higher dimensional space for the interfering signals at the legitimate receiver hence allowing for better chance of recovery. 

Our first achievable scheme incorporates code repetition at each transmitter over two consecutive time instants together with proper scaling of transmit signals to create a vector MAC between the two transmitters and the legitimate receiver that is of full-rank and a vector MAC between the two transmitters and the eavesdropper which is of unit-rank. 
Our second achievable scheme uses a carefully planned code repetition technique in which transmitters repeat their symbols in properly chosen time instants depending on the channel state such that the interference is perfectly cancelled at the legitimate receiver while the interference is sustained at the eavesdropper. This scheme also creates a full rank vector MAC to the legitimate receiver and a unit-rank vector MAC to the eavesdropper, however, in this case, the legitimate receiver vector MAC becomes an orthogonal MAC. 

For each scheme, we obtain the resulting achievable secrecy rate region. We show that the secrecy rates achieved by both schemes scale with SNR as $\frac{1}{2}\log(SNR)$. This also verifies the sub-optimality of plain Gaussian signalling and Gaussian signalling with Gaussian channel prefixing, as their achievable secrecy rates do not scale with SNR. 