  The broad landscape of new applications requires minimal hardware resources
without any sacrifice in Quality-of-Results. Approximate Computing (AC) has
emerged to meet the demands of data-rich applications. Although AC applies
techniques to improve the energy efficiency of error-tolerant applications at
the cost of computational accuracy, new challenges in security threats of AC
should be simultaneously addressed. In this paper, we introduce the security
vulnerability of the concurrent AC synthesis. We analyze the threat landscape
and provide a broader view of the attack and defense strategy. As a case study,
we utilize AC synthesis technique to perform malicious modifications in the
synthesized approximate netlist. Similarly, we provide a scalable defense
framework for trustworthy AC synthesis.
