An integral part of the Internet of Things (IoT) will be the reliable and efficient computation of functions depending on the data available at distributed terminals. Compared to current networks, this will result in a paradigm shift as the efficient transmission of raw data is no longer of highest priority. On the other hand, the IoT is expected to consist of billions of distrusting devices so that the security of computation results is important to guarantee a trustworthy network operation. As the information-theoretic limits of secure computation over noisy networks are unknown, we are presenting some initial results, which demonstrate that the problem of secure computation over a multiple-access wiretap channel may significantly differ from the one of securely communicating messages.