Mar 01, 2023
15 min read
A secure messaging app, like WhatsApp, keeps your private conversations, well, private! Whether it’s an embarrassing story, office gossip, or opening up about your feelings, the last thing you want is for someone to see your messages or have them used to serve you ads. Unless you’re using an encrypted messaging app, you’re leaving it all out in the open.
While encryption and privacy play a vital role in selecting which messaging app to use, it’s also necessary to use the messaging apps that our friends use. According to Statista (2022), WeChat, WhatsApp, and Facebook Messenger remain the world’s most popular messaging apps despite Facebook’s questionable privacy practices.
Choose an app that uses end-to-end encryption and open-source code and does not store your data. Many messaging apps on the market are not all as secure as they say. In fact, even the most popular messaging app in the world is not immune to scams (check out scams on WhatsApp). To make your choice easier, we have compiled a list of apps that offer end-to-end encryption, which means that no one can see your conversations unless they have a private key to decrypt your message. Most importantly, that means even the service provider can’t see your messages – not even abusive employers, hackers, or government officials. However, their additional features – and shortcomings – are all different.
We reviewed 10 encrypted messaging apps and present their pros and cons.
Viber, one of the strongest WhatsApp competitors, was initially designed for making calls over the internet but soon grew into a full-fledged chat app. You can use it for sending voice and text messages, photos, and videos to other users and groups of users. All chats, including group chats, are fully encrypted. You can use Viber on mobile devices and most desktop operating systems. Yet one of Viber’s most attractive features is its self-destructing messages. But this is where the good news ends.
The company is infamous for gathering the names and telephone numbers of its individual users as well as the people on users’ contact lists, even if those people do not use Viber. Viber even goes as far as following their users’ activity on social networks. It utilizes all the metadata it can get, so using Viber’s services is risky.
With over 1 billion users, WhatsApp is one of the most widely used messaging apps. It’s easy to use and offers features such as location and file sharing, gifs, and even desktop support. It also uses the powerful encryption protocol developed for Signal by Open Whisper Systems, which is considered the industry standard. The encryption features Perfect Forward Secrecy (PFS). This means that if someone manages to steal the decryption key to your conversation, they will only be able to see the last message you’ve sent. Everything else will remain private.
On the other hand, WhatsApp is owned by Facebook, which raises huge security concerns. Collecting users’ data is at the center of this social media giant’s business model, and it has failed to keep user data safe multiple times. Can we really trust Facebook, secure encryption notwithstanding?
On May 14, 2019, hackers found a severe WhatsApp vulnerability and used it to install surveillance malware on a select number of phones. This spyware was injected through WhatsApp audio calls (the targeted individual didn’t need to answer the call) and gave hackers access to victims’ text messages, emails, WhatsApp messages, contact details, call records, location, microphone, and camera. The vulnerability has now been patched.
Billions of people use Facebook and its messaging services, but few know that the company’s app offers end-to-end encryption. That’s because Facebook did a great job at hiding the feature. (Find out how to start a secret Facebook conversation here.)
It’s admirable that Facebook introduced this feature, but it doesn’t change the fact that the social media giant gathers data like who you text or how often you use the app. And let’s not forget that in 2018, Facebook became infamous for its multiple data breaches. It’s become hard to trust with your privacy!
There’s no doubt that Apple products have a good reputation when it comes to cybersecurity. iPhone owners’ alternative to text messages – iMessage – has default end-to-end encryption. However, it still has several vulnerabilities and is far from the most secure messaging platform.
Information like mobile numbers and contact lists is stored in plain text rather than hashes, as are timestamps and IP addresses. The app also fails to encrypt your metadata and any data synced to iCloud. If anyone hacks into your cloud, they will have backdoor access to your device.
Over 100 million people use Telegram. It’s true that the platform is easy to use, offers many extra features, and isn’t obligated to give out any user information to intelligence agencies (as far as we know). However, Telegram isn’t as secure as it wants us to believe.
First, it seems strange that such a security-oriented messaging app doesn’t have encryption turned on by default. Many people who use Telegram aren’t aware of this issue, which defeats the purpose of the app.
The Telegram encryption protocol is also flawed. It was developed by an in-house team with little experience in cryptography. Telegram servers aren’t open source, so the code hasn’t been audited by third parties. The company also doesn’t provide transparency reports.
Read on to see our top three secure messaging apps, or check out this video explaining why we picked them.
Silence is a secure SMS/MMS app that you can use even if you are not connected to the internet. You can send messages to anyone, not just Silence users. However, end-to-end encryption is only available when texting other Silence app users. It is also available on Android devices only.
All messages stored on your phone are encrypted, an incognito keyboard doesn’t remember your typing history, and a security screen option prevents users from taking screenshots. Security-wise, Silence is one of the most secure messaging apps, but if you are looking for more sophisticated features like video calls, you’ll have to look elsewhere.
Threema is a paid encrypted messaging app that provides a high level of anonymity. It offers private text and voice messages, voice and video calls, group polling, and file sharing. You don’t even have to provide your email address or phone number to sign up. Instead, you are assigned a randomly generated ID. You can verify your contacts through a QR code.
Your messages are deleted from Threema servers as soon as they’re delivered, leaving no trace. Metadata is not stored, except for the smallest amount needed for the app to function. Overall, Threema provides highly secure services and submit its software for external audits to confirm it, making it one of the most secure messaging apps out there. There is one drawback, possibly temporary, which is the small number of users — only around 11 million in the last quarter of 2022.
At first glance, Wire ticks all the boxes of a truly secure messaging app – it offers end-to-end encryption, complies with all European Union data and privacy laws, it’s open source, and it isn’t obligated to share its data with surveillance services. Plus, you can use it on most popular browsers like Firefox, Chrome, Safari, and Opera. However, Wire does collect and store some user data.
The creators of the app admitted to keeping records of who users contacted and, unfortunately, it’s all saved in plain text. It also stores users’ email addresses, phone numbers, and usernames. According to Wire, this information makes device synchronization easier and is deleted once the account is deactivated.
Wickr is one of the best secure messaging apps on the market. It’s open source and doesn’t collect user data or metadata. It also offers a “shredder” feature, which automatically deletes all conversations and files ever shared on the platform. You can set a timer for when to delete them. Most importantly, you don’t need a phone number or an email address to register, so it’s even easier to keep your life private.
The only downside is that Wickr isn’t as popular as Signal or Telegram. It was initially designed for businesses and enterprises, so it wasn’t widely advertised to everyday users. Wickr still offers a paid Pro version where you can have encrypted group video calls, something no other app currently offers. If you are not an entrepreneur and want to use Wickr, you’ll need to convince your friends to move as well.
Signal is the overall winner for both iOS and Android users. Signal created an encryption protocol that is now recognized as the most secure messaging app protocol available. It offers everything most users need – SMS, video and voice calls, group chats, file sharing, and disappearing messages – without stuffing the app with ads and collecting user data. It’s also an open-source platform so anyone can check it for vulnerabilities. Speaking of which, a potential security flaw may have been found by an Israeli security firm, which is why it’s best to always use a VPN alongside your favorite secure messaging apps.
Yes, you do need to use one of the best encrypted messaging apps because encryption protects your communication from being intercepted. Third parties can easily read unencrypted messages, while encrypted messages have an extra layer of protection. End-to-end encryption means that only the recipients of the message can read it because they are the only ones who have the decryption key.
With so many online threats putting us at risk, it is only wise to use one of the most secure messaging apps. Chances are most of your social crowd is using one, so you just need to decide which one to choose, based on the descriptions above.
Encrypted messages are much more secure than unencrypted, but you should still exercise caution when using even the most secure messaging apps. Follow this checklist to keep your private messaging app protected:
End-to-end encryption isn’t foolproof. Backdoors within encrypted apps are being exploited all the time. In 2020, security firm Cellebrite (used by the FBI, the Myanmar police, and governments), announced that it was able to circumvent Signal’s end-to-end encryption. WhatsApp was cautioned over its lack of end-to-end encrypted backups, and if you don’t make your Telegram chats “secret,” they won’t be encrypted. So, whichever encrypted messaging app you choose, make it even more secure by turning on the NordVPN app, which immediately hides your traffic from snoopers who could be lurking in the network.
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