1. Let's Encrypt! "https://letsencrypt.org/".
2. 3GPP. Functional stage 2 description of location services (lcs), 2015.
3. AbdelRahman Abdou, Ashraf Matrawy, and Paul Van Oorschot. Cpv: Delay-based location verification for the internet. IEEE Transactions on Dependable and Secure Computing, 2015.
4. AbdelRahman Abdou and Paul C Van Oorschot. Server location verification (slv) and server location pinning: Augmenting tls authentication. ACM Transactions on Privacy and Security (TOPS), 21(1):1, 2018.
5. Hadi Asghari, Michel Van Eeten, Axel Arnbak, and Nico ANM van Eijk. Security economics in the https value chain. 2013.