Signal Keeps Your Communication Private and Encrypted


Signal is an iOS, Android (and Windows) app that helps you keep your chats and voice calls private, encrypted and away from potential snoopers.

Signal, made by Open Whisper Systems, is an iOS, Android (and Windows) app that helps you keep your chats and voice calls private, encrypted and away from potential snoopers. And this, because it uses end to end encryption, so not even the developers of the service can get access to your communication.

Why Private, Encrypted Messaging?

Never in a million years did I think I would use a Jean Michel Jarre song in a technology article. However, in this particular case, it’s very appropriate, and you’ll understand why I’m doing this, in a second. The song is a collaboration between French electronic music pioneer Jean Michel Jarre and international surveillance programs whistleblower Edward Snowden.

At one point in the song, Snowden, one of Open Whisper Systems’ technology big fans, says, and I quote:

Saying that you don’t care about the right to privacy because you have nothing to hide is no different than saying that you don’t care about freedom of speech because you have nothing to say.

You can check out the song below:

That is what Signal is offering – a messaging service that makes sure your communication stays private, between you and the person you’re speaking. It’s supported by donations and grants, ad-free and free to use.

It uses the Curve25519, AES-256, and HMAC-SHA256 algorithms and encrypts everything end-to-end. Should someone get access to Signal’s servers, and the data on them would be pretty much useless to them. More details about the technology itself are available here.

How Does Signal Work?

Signal has a clean interface and using it is a straightforward process. After you install it (you can find it in the Google Play Store here and in the App Store, here), you’ll have to register the phone number you’re using on said phone, via a code you’ll receive by SMS. You only have to do this once for a phone number, which works as your account. You don’t need a password for your account, as the app is tied to the phone you’re using.

Signal is cross-platform, so if you are on Android, you’ll have no problem talking to a friend using an iPhone. The only essential thing is for all the people to have registered their number. After that is done, you just tap Signal’s dedicated button for starting a new conversation, and you’re all set, you can look for the respective contact in your phone book, very similar to how you would do on Whatsapp. While the screenshots you’ll see have been taken on the Android app, the iOS one isn’t really that different and the functionality is almost identical.

Signal Android search

Once you’ve found a contact using the app, you can start a chat. It works exactly as you’d expect. Including emoji and all.

Group chats are also possible, and you can also do voice calls – just use the phone button to call the other person. Voice calls are encrypted as well, with the key shown in the respective window.

Signal chat

You can also take pictures (just use the small camera button) or attach files which will be, in turn, also encrypted when kept on Signal’s servers.

Signal attach

You can always reset the session or check whether the encryption key is the same on your phone and the other person’s device. Another good thing is that the app provides security on the phone it’s installed on, as well. Namely, you can add a layer of security by setting up a password to unlock the interface, and you can set it to block screenshots being taken of it.

Signal privacy settings

The not so easy part of not having a user and password is that you can lose your archives when you switch numbers or phones. However, you can always export an encrypted archive, then import it on the new phone.

Signal import

These are, of course, just the main features of the Signal app. You can discover a lot of other interesting ones by yourself, as well.

Signal for Desktop

But I want to use it on my desktop, so I can say my boss is a jerk and do so in an encrypted medium, with the added advantage and speed of my computer keyboard! Say no more!

A Signal version for desktop does exist, albeit in a beta version.

It offers all of the great features of the mobile app, but it’s only available to you if you’re also a user of the Android app (iOS users don’t have access to it just yet) and it’s a client that syncs your messages with it. It’s a Chrome app, which you can install from the Chrome Web Store.

That is why, once you’ve installed it, you’ll need to open Signal on your Android smartphone and scan a QR code so the two apps can sync. Once that happens, keys will be generated, and messages will start coming into the desktop app, and it will work just like any other chat client would.

Signal desktop

The functionality itself doesn’t differ too much, but you don’t get emoticons, and there are no audio calls, either. Apart from that, there’s not much you can do on your phone that you can’t do in the desktop client.

The Bottom Line and the Future

Whatsapp encrypts your chat communications, too. The future is one in which privacy regarding personal communication will play an increasingly important role in all of our lives. Signal is working well so far and deserves a close look. It seems like it will become even more of a significant player in the market than Google’s planned Allo messaging app.

What’s your take? Leave a comment below and tell us your thought on the encryption battle.



  1. Jim  

    I have a couple of questions and I apologize if they seem dumb.

    First, since i know more than a few of my contacts will NOT install this on their end, will I still be able to use other messaging apps or will this take over all of my SMS messaging?

    I also use Google Voice for some things. My Google Voice number is separate from my main cell number. Will having to register my phone number with Signal interfere with my ability to use Google Voice or any of it’s features?

    I like the idea of having more than one option for doing things so if this app is going to take over everything then it is not for me at this time. If I can keep what I have and just use this app when I choose then it is absolutely worth a try.

    Thanks for any help that anyone can offer me with this.

    • Bogdan Bele  

      Jim, sorry for the delayed answer, I just saw your comment. I’ll try to answer the best way I can.
      You can use the app for SMS, but it’s not necessary. However, if you want encrypted chats, contacts will also have to install it, no way around that.
      Signal should have nothing to do with Google Voice, it only uses your number to register, nothing else.
      I personally used it just for chat and voice calls, but it didn’t affect any of my phone’s functions in any way.

      • Jim  

        Thanks for the reply Bogdan. No apologies necessary, we all live in a very busy world. ::)

        That answers my questions. I think I will give the app a try with the few contacts I know will try it out with me.

  2. Rich  

    Great Post of Information for Subscribers. Thank you very much for the info Groovypost and Bogdan!

    • Bogdan Bele  

      Thanks, Rich, glad you found the article helpful.

  3. Joe  

    how is it private if you want my Device ID & Call Information.

    • Bogdan Bele  

      Well, if you want to be completely paranoid on that front, I guess you could use it on the cheapest Android phone you can find, using a prepaid card.

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