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FairEmail
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M66B 3 years ago
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FAQ.md
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@ -393,7 +393,7 @@ Fonts, sizes, colors, etc should be material design whenever possible.
* [(181) How do I use VirusTotal?](#user-content-faq181) * [(181) How do I use VirusTotal?](#user-content-faq181)
* [(182) How can I select how a link should be opened?](#user-content-faq182) * [(182) How can I select how a link should be opened?](#user-content-faq182)
* [(183) How do I use Send?](#user-content-faq183) * [(183) How do I use Send?](#user-content-faq183)
* [(184) How do I password protect text?](#user-content-faq184) * [(184) How do I password protect content?](#user-content-faq184)
[I have another question.](#user-content-get-support) [I have another question.](#user-content-get-support)
@ -4986,17 +4986,18 @@ Send is only available in non-Play Store versions of the app (since version 1.19
<br /> <br />
<a name="faq184"></a> <a name="faq184"></a>
**(184) How do I password protect text?** **(184) How do I password protect content?**
Select some text by long pressing it, and in the style toolbar at the bottom tap on the *<ins>A</ins>*-button and select *Password protect* in the pop-up menu. Select some text by long pressing it, and in the style toolbar at the bottom tap on the *<ins>A</ins>*-button and select *Password protect* in the pop-up menu.
Password protected text is sent as a [URI fragment](https://en.wikipedia.org/wiki/URI_fragment) and not stored on third party servers, and decrypted in the browser with JavaScript. Password protected content is sent as a [URI fragment](https://en.wikipedia.org/wiki/URI_fragment) and decrypted in the browser with JavaScript.
In other words, password protected content is never stored on or seen by third party servers.
Password protected text is encrypted with AES/GCM with a 256 bits key derived with PBKDF2/SHA-512 with 120,000 iterations. Password protected content is encrypted with AES/GCM with a 256 bits key derived with PBKDF2/SHA-512 with 120,000 iterations.
With a sufficiently long/complex password, which is communicated to the recipient securely, this is considered safe in 2022 and for the foreseeable future. With a sufficiently long/complex password, which is communicated to the recipient securely, this is considered safe in 2022 and for the foreseeable future.
The maximum message text is 1,500 characters, which includes HTML formatting tags. The maximum content size is 1,500 characters, which includes HTML formatting tags.
Images will be replaced with place holders to reduce the content size. Images will be replaced with placeholders to reduce the content size, but other formatting, like bold, italic, etc., will be retained.
Cross-site scripting (XSS) is prevented by using [DOMPurify](https://github.com/cure53/DOMPurify) (Apache License Version 2.0). Cross-site scripting (XSS) is prevented by using [DOMPurify](https://github.com/cure53/DOMPurify) (Apache License Version 2.0).

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