Proton Technologies AG

ProtonMail, operated by Proton Technologies AG, is a Swiss‑based provider of end‑to‑end encrypted email services that also offers a virtual private network (VPN) solution. The company’s headquarters are located in Switzerland, benefiting from the country’s strong privacy laws and neutral jurisdiction. Its core product encrypts messages client‑side, ensuring that only the sender and recipient can read the contents, a feature aimed at journalists, activists, and other users requiring confidential communication. By combining encryption with Swiss legal protections, ProtonMail positions itself as a trustworthy platform for sensitive correspondence in a global market where data surveillance concerns are growing. The service is accessible via web browsers, desktop clients, and mobile applications, allowing users to maintain secure communication across devices. Its emphasis on privacy distinguishes it from conventional email providers that typically retain access to user data.

ProtonMail’s infrastructure has repeatedly been the target of large‑scale cyber attacks, highlighting both its visibility and the robustness of its defenses. In June 2018 the company endured a multi‑vector distributed denial‑of‑service (DDoS) assault that peaked at 500 Gbps, employing UDP reflection, TCP bursts and SYN floods, which caused intermittent email and VPN disruptions despite mitigation by Radware’s protection services. A later incident in November 2015 involved a two‑stage DDoS attack that prompted the firm to pay a $6,000 Bitcoin ransom, after which it instituted a $100,000‑per‑year mitigation strategy funded through user donations to counter future threats. These episodes demonstrate that ProtonMail operates at a scale sufficient to attract sophisticated adversaries while maintaining operational continuity through continuous investment in defensive measures. The company remains an independent entity under Proton Technologies AG, with no publicly disclosed parent or subsidiary relationships beyond its Swiss incorporation.