Security and privacy

    1. Proton Account
    2. Security and privacy

    Infrastructure and Threat Model

    Learn more about Proton Mail’s Infrastructure and Threat Model

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    Why is Proton warning me that my device’s clock is wrong?

    Proton services use the time on your device to verify that keys and signatures are still valid. This helps ensure your files stay secure.

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    Web Cryptography API

    Proton Mail requires a browser that supports the Web Cryptography API in order to secure your data. We explain what Web Crypto is.

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    Accessing onion sites in Firefox

    Proton Mail provides email access over the Tor network through our onion site at https://protonirockerxow.onion. If you are connected to Tor and using Firefox, there is another step you may have to follow to be able to access onion sites.

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    How to setup encrypted email over Tor

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    Connection is Not Secure Warning

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    Turn off Private Browsing (iOS Safari)

    Proton Mail utilizes cookies to implement zero access end-to-end encryption. Learn how to turn off Private Browsing on iOS Safari

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    How to clean cache and cookies

    Both the browser cache and cookies can cause minor issues when using Proton Mail. In this article, we show you how to clean them in all major browsers.

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    How to enable JavaScript

    JavaScript must be enabled in your browser for Proton Mail to work correctly,. In this article, we show you how to enable JavaScript in all major browsers.

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    How to enable cookies

    One of the requirements for using Proton Mail on some browser is enabling cookies. Learn how to enable cookies for easy usage of Proton Mail

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    Why do you need JavaScript, sessionStorage, and cookies?

    Proton Mail and Proton VPN require JavaScript, sessionStorage, and cookies to ensure the security and privacy of your data.

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    How to access Proton Mail in Private Browsing (Incognito) mode

    Learn how to use Private Browsing (also known as Incognito) mode in your browser to access Proton Mail more privately.

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    PRNG

    Proton Mail generates random numbers in several places to secure your account. Learn why you need PRNG to use Proton Mail.

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    Recommended browsers

    Proton Mail has been fully tested and works well with most modern browsers. But we only recommend browsers that also respect your privacy.

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    Proton Mail’s TLS/SSL Certificate

    Proton Mail uses Let's Encrypt as its certificate authority. This article describes the steps to verify our certificate for various browsers.

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    Screen not loading in iPhone (iOS) (“Absolute Security – requires modern web browser”)

    Troubleshooting errors using Proton Mail in iOS browsers (Safari, etc)

    1. Proton Account
    2. Security and privacy
    3. Browsers and cookies

    Allowing sessionStorage

    Allowing session storage on most used browsers Chrome, Firefox, Safari, IE

    1. Proton Account
    2. Security and privacy
    3. Encryption and keys

    Security requirements and recommendations for OpenPGP keys

    To keep your messages safe, Proton Mail will not allow you to import weak keys or keys that have not been standardized for use with OpenPGP.

    1. Proton Account
    2. Security and privacy
    3. Encryption and keys

    How to upload your backup private keys

    Key import allows you to add existing PGP keys to one of your Proton Mail addresses or restore backed-up keys if you lose your password.

    1. Proton Account
    2. Security and privacy
    3. Encryption and keys

    How to create new encryption keys

    Proton Mail allows you to choose which kind of encryption keys to use for your accounts. Learn how to change your encryption keys.

    1. Proton Account
    2. Security and privacy
    3. Encryption and keys

    Key management

    1. Proton Account
    2. Security and privacy
    3. Encryption and keys

    How to download your public and private keys

    Learn how to download your encryption keys from Proton Mail to send PGP-encrypted emails to non-Proton Mail users or use another PGP client.

    1. Proton Account
    2. Security and privacy
    3. Encryption and keys

    How is the private key stored?

    Proton Mail private key is stored encrypted on your browser using your mailbox password. Learn more about your private key.

    1. Proton Account
    2. Security and privacy
    3. Mobile security

    Android Keystore issues

    Proton apps on Android use the Android Keystore system to encrypt your passphrase, but on less than 1% of devices there is an issue.

    1. Proton Account
    2. Security and privacy
    3. Mobile security

    How to use the auto-lock feature on Android

    Set your Proton Mail Android app to automatically lock with a pin code

    1. Proton Account
    2. Security and privacy
    3. Mobile security

    How to activate FaceID, TouchID, and PIN code lock on the Proton Mail iOS app

    How to setup TouchID or a Pin Lock on the Proton Mail app

    1. Proton Account
    2. Security and privacy
    3. Mobile security

    Finding the version number of your Android or iOS device

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