# Trustworthiness of Situational Awareness: Significance and Quantification
## 5 Numerical Results
### Case 1: High-Trust Information Source
We note that different precision scores can be assigned for the source depending on the AI model. _Quality:_ The UAV obtains high-resolution images of objects of interest, and thus the quality score can be assigned as 1. _Usability:_ The UAV is mobile and can gather the information about different targets as desired; thus, the UAV can be assigned a usability score of 1. Since, in our model, there are eight metrics that influence the trustability of the source, we assign a weight of 0.125 (i.e., 1/8 = 0.125) to each metric. We note that different weights can be assigned to different metrics depending on the COP builder designer and the  
Figure 3: Quantification of trustworthiness of COP—case of high-trust information source. mission needs. Using Equation (1), the trustworthiness score of the UAV \(\mathcal{T}_{UAV}\) can be determined as \(\mathcal{T}_{UAV}=(0.125)(1)+(0.125)(1)+(0.125)(1)+(0.125)(1)+(0.125)(1)+(0.125)( 0.96)+(0.125)(1)+(0.125)(1)+(0.125)(1)=0.995\). Table 1 summarizes the scores for different metrics influencing UAV trustworthiness for this case. **Ground Control Station:** Here, we calculate the trustworthiness of the GCS based on Equation (3) of our proposed model (Section 4.1). To obtain the trustworthiness of a node, we first need to obtain the scores of various metrics (i.e., confidentiality, integrity, authenticity, availability, non-repudiation) stipulated in Equation (3) that affect the trustworthiness of a node. In the following, we calculate the score of these metrics for this case. _Confidentiality:_ In this case, the encrypted information from the UAV is relayed by the GCS to the GN, and thus for the GCS can be assigned a confidentiality score of 1. _Integrity:_ The GCS also relays the HMAC of the message sent by the UAV, and so an integrity score of 1 can be ascribed to GCS. _Authenticity:_ For this case, the GCS can be successfully authenticated with an authentication protocol, and thus an authenticity score of 1 can be attributed to the GCS. _Availability:_ Assuming that the GCS is responsive to the authentication and other protocols' messages, and is available, its availability score can be assigned as 1. Since, in our model, there are four metrics that influence the trustability of the node, we assign a weight of \(1/4=0.25\) to each metric. We note that different weights can be assigned to different metrics depending on the COP builder designer and the mission needs. Using Equation (3), the trustworthiness score of the GCS \(\mathcal{T}_{GCS}\) can be determined as \(\mathcal{T}_{GCS}=(0.25)(1)+(0.25)(1)+(0.25)(1)+(0.25)(1)=1\). **Gateway Node:** The trustworthiness of the GN can be calculated similarly to that for the GCS based on Equation (3), and can be given as \(\mathcal{T}_{GN}=(0.25)(1)+(0.25)(1)+(0.25)(1)+(0.25)(1)=1\). **Router Node:** The trustworthiness of the RN can be calculated similarly to that for the GCS based on Equation (3), and can be given as \(\mathcal{T}_{RN}=(0.25)(1)+(0.25)(1)+(0.25)(1)+(0.25)(1)=1\). **Data Fusion Node:** The trustworthiness of the DFN can be calculated similarly to that for the GCS based on Equation (3), and can be given as \(\mathcal{T}_{DFN}=(0.25)(1)+(0.25)(1)+(0.25)(1)+(0.25)(1)=1\). **Link \(\boldsymbol{l_{1}}\) or \(\boldsymbol{l_{UAV-GCS}}\):** Here, we calculate the trustworthiness of the radio link between the ISR UAV and the GCS based on Equation (4) of our proposed model (Section 4.1). To obtain the trustworthiness of a link, we first need to obtain the score of various metrics (i.e., confidentiality, integrity, availability, and quality) stipulated in Equation (4) \begin{table}
\begin{tabular}{c c c} \hline \hline
**Metric** & **Score** & **Weightage** \\ \hline Confidentiality & 1.0 & 0.125 \\ Integrity & 1.0 & 0.125 \\ Authenticity & 1.0 & 0.125 \\ Availability & 1.0 & 0.125 \\ Non-reputability & 1.0 & 0.125 \\ Precision & 0.96 & 0.125 \\ Quality & 1.0 & 0.125 \\ Usability & 1.0 & 0.125 \\ \hline \hline \(\mathcal{T}_{UAV}\) & 0.995 & – \\ \hline \hline \end{tabular}
\end{table} 
Table 1: ISR UAV trustworthiness score.