Sending messages to your relatives is essential

But these messages should stay private.
We will see the different options to do that.

Different categories of messages


Instant messaging app

Messenger, Whatsapp, Signal, Telegram...
You probably use at least one of these apps to communicate with your friends.
We will see our favorite app and explain you why we're using this one.



E-mails are widely used in companies; they are also sometimes used with family and friends or for acquaintances. We will see how to make emails unreadable by people/companies/governement who would intercept them.



SMS can be useful if you don't have internet, or if you want to send messages to people that don't have.
We will see how to make SMS unreadable by people/companies/governement who would intercept them.

01. Signal

The messaging app recommanded by E. Snowden

Signal is an app available on mobile (Android/iOS) and PC (Linux, Windows, Mac).
With it you can create group conversations, send files, send gifs and smileys, make calls (voice and video) ... In short, everything that a classic messaging application offers.
But the advantage of the latter is its strong emphasis on privacy.
Indeed, they use end-to-end messaging by default.
You can install the application as your SMS application, and it will automatically send encrypted messages to your contacts if they use Signal!
Signal is an independent non-profit organization, they do not sell your data and have no interest in doing so.
Although they cannot see the encrypted messages you send, they can (technically, but probably do not) know the account of the person you are sending the messages to.


How to know if an messaging app is secure / keep your messages private ?

You could check 3 points :

- the app client is open-source : Every human on the earth can verify the code and see if their is no backdoor; and check if there is no vulerability breach.

- end-to-end encryption : it should at least be available; but the best is to activate it by default.

- the compagny behind the app : even if the app, like Whatsapp or Messenger, are offering end-to-end encryption, they can be owned by compagnies (here Facebook) which can accept to install backdoor so government can read messages. It can be (very) easily done if the app isn't open-source.

02. Mails

We present you two solutions to encrypt your mails so they can't be read by people that intercept them.


We already saw another product of the Proton Technologies, ProtonVPN.

But their first famous product is ProtonMail, probably the most secure mail provider. It's fully open-source, from their cryptography to their webclient.

They describe here why they are more secure than Gmail; and here the different secure technologies they are describing.

They are also transparent concerning the different possibilities of encryption, depending if your recipient has protonMail.

ProtonMail is free (but very limited), you can also upgrade to higher options.


Basically this is an addon but you'll also need an account.

It's pretty simple to use - less than ProtonMail - but the advantage is that it will work with almost every mail provider, so you won't have to change of mail provider, transfer your old mails etc ...

If you want to use it with other people, they willneed an account and they must download the app.

You can get Mailvelope here.

03. SMS

Even if you encrypt your SMS, your SMS provider (which generally is your ISP) will know to whom you're sending your messages, even if it won't be able to know the content of them.

To do so, you can us Silence, an open-source software.
Silence is forked from textSecure, made by the team behing Signal, that abandoned the project to Signal. Users who wanted to continue using encrypted SMS (instead of encrypted messages) forked the software and made Silence.

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