An illustration of an encrypted flash drive.

How to secure data on your external hard drives and USB peripherals

September 8th, 2020 in Security

USB peripherals (commonly known as “flash drives”), memory cards, and external hard drives all make backing up and sharing your data simple. And they are becoming more critical as modern-day schooling, work, and life are increasingly awash in data. But what happens if you lose or misplace one of these devices? In many cases, the …

Temporary TLS certificate update for September 2020

September 4th, 2020 in Security

UPDATE Sept. 15, 2020: SwissSign has dealt with the DDoS attack and has taken measures to prevent similar outages in the future. Therefore, we are using them again as our certificate authority. We have updated the fingerprints at the bottom of this article. Proton has recently begun using Let’s Encrypt instead of SwissSign as the …

ProtonDrive

The ProtonDrive security model

August 31st, 2020 in Encryption, Security

This article documents ProtonDrive’s security model by showing how it uses end-to-end encryption to protect your sensitive data. While somewhat technical, this document is meant to be accessible to a general audience and attempts to explain how ProtonDrive works in plain language. ProtonDrive is in the final stages of development before our beta launch later …

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Chinese government builds new Great Firewall around Hong Kong

July 6th, 2020 in Articles & News

The governing body of Hong Kong rushed approval of Article 43, which grants sweeping powers to Hong Kong law enforcement, including the ability to intercept private communications and censor online media without a warrant. These regulations specify the powers that the Hong Kong government can take under the National Security Law that was passed by …

An image of ProtonMail's open source encryption libraries.

OpenPGP.js and GopenPGP are easier to test with other encryption suites

June 18th, 2020 in Encryption

As part of our mission to make security, privacy, and freedom accessible to all, we maintain two open source cryptography libraries that make it easier for developers to apply strong encryption in their projects. We have been the maintainers of OpenPGP.js since 2016 and GopenPGP since 2019, meaning we are responsible for ensuring these repositories …

An illustration of a TLS certificate.

What is a TLS/SSL certificate, and how does it work?

June 11th, 2020 in Security

Whenever you send or receive information on the Internet, it passes through a network of multiple computers to reach the destination. Historically, any of these computers could read your data, because it was not encrypted. Much of this data is quite sensitive — and valuable to hackers. It can include private communications that are not end-to-end …

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Getting started with ProtonMail the easy way

May 28th, 2020 in Articles & News

This article takes you through all the factors to consider when moving to a new email provider and leaving privacy-invasive companies such as Gmail, Outlook, and Yahoo Mail. Switching your email provider may feel as difficult as moving to a new house or changing your name. There’s so much to do: telling your contacts, updating …

illustration of ProtonMail Android client security

ProtonMail Android client security

April 23rd, 2020 in Security

The following article presents a high-level overview of ProtonMail’s Android security model and explains how the app protects users’ sensitive data. You can view our Android app’s open source code on GitHub. We also explain the importance of open source to Proton in our Android open source announcement.  For more information on what threats ProtonMail …

Illustration of the Bridge security model

The ProtonMail Bridge security model

April 15th, 2020 in Security

ProtonMail Bridge is a desktop application that runs in the background on your computer and encrypts and decrypts your mail as it enters and leaves your device. It allows for full integration of your ProtonMail account with email clients like Microsoft Outlook, Mozilla Thunderbird, and Apple Mail. This document discusses how Bridge handles sensitive information, …

How to protect your data as COVID-19 scams soar

March 31st, 2020 in Articles & News

As the world is grappling with a sharp rise in the number of COVID-19 cases, fraudsters are trying to capitalize on the state of panic and even the goodwill of others. More than 1,400 coronavirus-related domains were registered over the past three months, many used for phishing scams, misinformation, or as an interface for fraudulent …

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Introducing alternative routing to prevent censorship of Proton apps

March 12th, 2020 in Releases

We’re announcing today a new anti-censorship system that can help users access our website if their government, ISP, or network administrator has blocked Proton services. The alternative routing feature is not yet deployed as of writing, but in the coming weeks, we plan to release it across all of our mobile and desktop applications. With …

Illustration of vulnerability disclosure

ProtonMail’s responsible vulnerability disclosure policy

March 5th, 2020 in Security

Our mission at ProtonMail is to make online safety accessible to everyone. Millions of people depend on our products to secure their communications and keep their information private. In order to make this high level of security accessible to all Internet users, we must work to integrate ProtonMail seamlessly with third-party products, from web browsers …

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Proton Technologies AG

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CH-1228 Plan-les-Ouates, Genève, Switzerland

For support inquiries, please visit
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For security related discussions
security@protonmail.com