## 3 Materials and Methods
### Construction of a Privacy Named Entity Tag Set
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**Detection Technique**} & \multicolumn{2}{c}{**Exposure Risk**} & \multicolumn{2}{c}{**De-Identification Scope**} \\ \cline{3-10} \multicolumn{1}{c}{**Items**} & \multicolumn{1}{c}{\begin{tabular}{c} **Regular** \\ **Expression** \\ \end{tabular} } & \multicolumn{1}{c}{\begin{tabular}{c} **NER** \\ **Exposure** \\ \end{tabular} } & \multicolumn{1}{c}{\begin{tabular}{c} **Sole** \\ **Exposure** \\ \end{tabular} } & \multicolumn{1}{c}{\begin{tabular}{c} **Combined** \\ **Exposure** \\ \end{tabular} } & \multicolumn{1}{c}{\begin{tabular}{c} **Pseudonyms/** \\ **Substitutions** \\ \end{tabular} } & \multicolumn{1}{c}{\begin{tabular}{c} **Deletion** \\ **Categorization** \\ \end{tabular} } & \multicolumn{1}{c}{\begin{tabular}{c} **Masking** \\ **Tasking** \\ \end{tabular} } \\ \hline Personal & Name & \(\triangle\) & M & H & v & v & & v \\ \hline \multirow{4}{*}{General} & Nickname & \(\triangle\) & M & M & v & v & & v \\  & Date of birth & \(\triangle\) & L & M & v & v & v & v \\  & Age & v & L & M & v & v & v & v \\  & Amiversaries & \(\triangle\) & L & L & v & v & v & v \\  & Notanity & v & M & L & v & v & v & v \\ \hline \multirow{4}{*}{Body} & Gender & & L & L & v & v & & v \\  & Height & v & M & L & v & v & v & v \\  & Weight & v & M & L & v & v & v & v \\  & Blood type & & M & L & v & v & & v \\ \hline \multirow{4}{*}{Health} & Medical insurance & \begin{tabular}{c} v \\ number \\ Medical history \\ \end{tabular} & \begin{tabular}{c} v \\ (Many false \\ detections) \\ \end{tabular} & \(\triangle\) & H & H & v & v & & & v \\  & v & M & M & v & v & v & v \\ \hline \multirow{4}{*}{\begin{tabular}{c} Unique identification number \\ number \\ \end{tabular} } & Resident registration & v & \(\triangle\) & H & H & v & v & & v \\  & Alien number & v & \(\triangle\) & H & H & v & v & & v \\  & Passport number & \(\triangle\) & \(\triangle\) & H & H & v & v & & v \\  & Driver’s license & v & \(\triangle\) & H & H & v & v & & v \\  & number & v & \(\triangle\) & H & H & v & v & & v \\ \hline \multirow{4}{*}{\
\begin{tabular}{c} General identification \\ information \\ \end{tabular} } & Mobile phone number & v & \(\triangle\) & H & H & v & v & & v \\  & General phone/FAX & v & \(\triangle\) & M & M & v & v & & v \\  & number & v & \(\triangle\) & H & H & v & v & & v \\  & Card number & v & \(\triangle\) & & H & v & v & & v \\  & Account number &
\begin{tabular}{c} (Many false \\ detections) \\ \end{tabular} & \(\triangle\) & H & H & v & v & & v \\  & Email address & v & v & H & v & v & & v \\  & License plate number & \(\triangle\) & H & H & v & v & v & v \\ \hline \multirow{4}{*}{Workplace} & Workplace & \(\triangle\) & M & M & v & v & & v \\  & Department & & M & M & v & v & & v \\  & Job tile/position & v & M & M & v & v & v & v \\ \hline \multirow{4}{*}{School} & School & v & M & M & v & v & & v \\  & Grade & v & M & L & v & v & v & v \\  & Major & \(\triangle\) & M & L & v & v & v & v \\ \hline \multirow{4}{*}{Location} & Address & v & H & M & v & v & v & v \\  & Building name & v & L & M & v & v & & v \\ \cline{1-1}  & Address (hometown) & \(\triangle\) & H & M & v & v & v & v \\ \cline{1-1}  & House type & \(\triangle\) & L & L & v & v & & v \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Analysis of targets for personal information collection. as resident registration and passport numbers, financial information, credit card and bank account numbers, and personal information, such as workplace, department, and position. Although this information can be detected using regular expressions, it has a high false detection rate. A privacy NER tag set was developed by analyzing the existing NER tags for the 33 selected items. First, we added a new tag set for items without existing NER tags to align with the personal information category. These items included CV_SEX (gender), TM_BLOOD_TYPE (blood type), OG_DEPARTMENT (department), QT_IP (IP information), and CV_MILITARY_CAMP (military unit).