Proton
An illustration of Proton Mail's code being examined.

At Proton(ventana nueva), we believe everyone should be in control of their personal data. A critical component of controlling your data is having the ability to make informed decisions about who you entrust with your data and how it is secured. Most companies rely on security through obscurity and do not share their code, making it impossible for you to accurately assess how secure their service is.

Rather than relying on secrecy to protect our code, we believe in security through transparency, which means we: 

  • Make all our apps open source to leverage the expertise of IT security experts and the Proton community
  • Commission independent security experts to conduct regular audits of our code
  • Share the audit reports with the public

By subjecting our apps to rigorous public examination, we ensure that any potential vulnerabilities are swiftly discovered and resolved. 

We have previously shared the results of the audits for our Proton Mail(ventana nueva) and Proton VPN(ventana nueva) apps. Now that we have released the new Proton Mail, including Proton Calendar(ventana nueva), we would like to share the results of its audit as well.

The new Proton Mail is secure

Like all Proton applications, the new Proton Mail is open source, and anyone can inspect its code for themselves on GitHub(ventana nueva)

Prior to their release, the source code of both the new Proton Mail and Proton Calendar underwent an extensive security audit. We are happy to announce the final report was overwhelmingly positive, and the audit uncovered no major issues or security vulnerabilities

Read the audit report for the new Proton Mail(ventana nueva)

This security audit was carried out by Securitum(ventana nueva), a leading European security auditing company. Securitum currently oversees more than 300 security testing projects every year, including for many top European banks.

Read the latest audit reports for all Proton services

Security through transparency

Proton Mail was founded by scientists who met at the European Organization for Nuclear Research (CERN), and the scientific principles of peer review and transparency are core values of our team. Just as we would not trust a result without first seeing the underlying data, we do not expect you to trust us without being able to examine our work for yourselves. 

If you have questions or comments about the security audit for the new Proton Mail, please share them with us! Join the conversation on Twitter(ventana nueva) and Reddit(ventana nueva).

Artículos relacionados

A stylized icon resembling the Google Photos logo with a dark triangular warning sign containing an exclamation mark, representing Google Photos safety issues
en
Is Google Photos secure to share private pictures? Here's how its protections can fall short — and other options for safer photo sharing.
how to change your email address
en
Learn how to change your email address across email services, including Gmail, Yahoo, Outlook, and iCloud without risking your data.
Who is responsible for protecting CUI?
en
  • Guías de privacidad
This article breaks down CUI, the parties responsible for marking and guarding it, and what goes into keeping it secure.
The cover image for a Proton Pass blog about how to change your Facebook password settings. The image shows the Facebook icon with a password field beneath it and a tick at the end of the password field
en
Here's a step-by-step guide for how to change or reset your Facebook password settings — and how to create a strong password you'll remember with Proton Pass.
A Gantt chart showing progress through the product roadmaps.
en
  • Actualizaciones del producto
We're sharing the roadmaps for all our services so you can see what's coming and give us your feedback.
A laptop with a Gantt chart, representing the Proton Drive roadmap for spring 2025
en
  • Actualizaciones del producto
  • Proton Drive
This spring, we're adding long-awaited features in Proton Drive, like albums, folder sync on macOS, and new Docs formatting tools. See more.