IT security is crucial to success in today’s economy. A data breach can cost you time, money, and your customers’ trust. Yet, due to a lack of funding, time, and expertise, most small- and medium-sized businesses (SMEs) are unprepared to deal with basic cyber threats. As a result, most victims of data breaches are small …

We’re happy to announce that the ProtonMail iOS app is now fully open source.  We believe in transparency, the power of community, and building a more private and secure future for all. That’s why our web app has been open source since 2015, and it’s why we have contributed to the open source community by …

This post documents ProtonMail’s iOS security model and illustrates how our application protects sensitive data on client iOS devices. The advantages and limitations of this approach our discussed, and the source code can be viewed here. You can also ProtonMail’s iOS open source announcement. You can also read our previously published ProtonMail threat model, which …

One of the unique innovations of the ProtonMail iOS app is the AppKey Protection System. This is an extra layer of encryption on top of Apple’s built-in local encryption that protects sensitive Proton data stored on your device. When you have AppKey Protection System enabled, your ProtonMail data is more secure against malware from hackers …

Today we’re unveiling our biggest redesign ever. Not only does ProtonMail Version 4.0 look more modern on the surface, it’s part of our ongoing transition to a newer software framework that lays the foundation for future features, new products, and better customization.  You can start using the ProtonMail Version 4.0 beta right now. It’s open …

Since we launched in 2014, ProtonMail has been the preferred email service provider for activists around the world. Protecting freedom of speech and democracy is, after all, one of the main reasons we created ProtonMail in the first place. Normally, this would not be of particular interest to anyone: we have always believed that all …

Earlier this year, security researchers discovered a fire sale taking place on the dark web: 2.2 billion usernames and passwords that had been stolen in data breaches and compiled into a multi-volume database dubbed as Collection #1-5. With so many passwords leaked, there is a decent chance that yours was among them. (You can check …

This is a challenging question to answer, but it is also a fair one, so we wanted to share our views about this in a blog post. In general, we strive to make our service require as little trust as possible. We encrypt data in a way that does not allow us to decrypt it, …

We created ProtonMail in 2014 because we were concerned about mass surveillance. At the time, governments were spying on our emails, text messages, and phone calls. Now there’s a new surveillance threat, but this time the information at risk isn’t our communications — it’s our bodies. Today, we’re joining other privacy advocates and businesses to …

Version 1.12 of the ProtonMail Android app makes it easy for anyone to manage multiple ProtonMail accounts right on their phone. This feature allows you to be logged into multiple ProtonMail accounts at the same time, and easily switch between their inboxes. Multi-account support We have received numerous requests from small- and medium-sized business owners, …

At ProtonMail, your security is always our first priority. That’s why, in recent months, we have added support for MTA-STS, DANE, WKD, DNS CAA, and much more to further enhance user security. We know that many people, such as journalists, use ProtonMail for sensitive communications and may be targeted by highly sophisticated threat actors. As …

As there has been a lot of inaccurate information circulating online about ProtonMail and Huawei, the purpose of this blog post is to clarify the facts and provide information to the Proton community. Background On September 5th, 2019, we announced that we would be bringing ProtonMail to the F-droid alternative app store as part of …