# Sentinel: Automated Detection of Android Vishing Apps Using Optical Character Recognition
## 4 Design
### Sentry of Ventinel
#### 4.1.1 Duplicated Contacts Verification
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* (31) Phishing Activity Trends Report 4 th Quarter 2023. Available online: [[https://apwg.org/trendsreports/](https://apwg.org/trendsreports/)]([https://apwg.org/trendsreports/](https://apwg.org/trendsreports/)) (accessed on 25 April 2024). * (32) Android Security Bulletins.