1. WhatsApp

In April of last year, WhatsApp enabled end-to-end encryption on all platforms, which means that conversations can not be read by anyone other than you and the person to whom you are sending messages. Not only are your chats protected, but WhatsApp provides a security code so you can verify that someone is not intercepting your messages and sending them (this is known as the 'man in the middle' attack). At this point, you may remember earlier this month that there was a warning about a vulnerability in WhatsApp's secure messages, but then it was shown to be false.

< p> 2 Signal

This privacy-aware messaging application comes from Open Whisper Systems , which has the seal of approval of Edward Snowden, no less. Not only is Signal easy to use, but, like WhatsApp, conversations are encoded end-to-end.

Signal's source code is available online so security experts can constantly check for it of vulnerabilities too. In fact, WhatsApp uses part of the Signal source code for messages.

3. FrozenChat

In addition to its cool name and modern design, FrozenChat also offers end-to-end encryption with OTR (Off the Record) messages. This means that not only are your messages protected and that you can verify who you are talking to, but you also have a denial attitude: anyone can falsify a message after the conversation ends. In other words, it is impossible to prove that a message has been sent by you. FrozenChat is open source and also supports the open XMPP protocol that is used on thousands of servers. These are administered by volunteers, so there is not a single central server that can be confiscated or removed. & Nbsp;

4. ChatSecure

Like FrozenChat, ChatSecure supports Off the Record messages and the open XMPP protocol. The Android version is no longer maintained, but the iOS is still actively developing. When you start a conversation, you will see a digital 'fingerprint' that you can check with your friend to make sure no one is intercepting messages.

 ChatSecure also includes an experimental feature that allows the use of Tor. This should hide your location when the messaging contacts. Try using an XMPP server that uses a hidden Tor service to keep your conversation completely on the 'dark web' as it is more secure. 

5. Wickr Me

Wickr is available for both Android and iOS. Not only does it offer end-to-end encryption, it can also eliminate metadata such as the timestamp of conversations. Messages can also be programmed to self-destruct after a certain period of time has expired. The application includes a handy deletion function to erase messages securely.

Although several security organizations have audited the Wickr Me code, it has not been released to the public, so there is no way to check if there are security errors or deliberate back doors. It is also unclear how effectively the application can delete data, so Android users must also encrypt their devices.

6. Silence

Silence is an impressive replacement for the usual Android SMS application. It stores all the messages it receives in an encrypted database (by default, this is not protected by a password, but you can set one if you wish). If two people use Silence, the application will automatically recognize this and use encryption.n from end to end to send text and media. Otherwise, it can work as a normal SMS application.

7. Silent Phone

 This application comes from the good people of Silent Circle: industry leaders in mobile security (and creators of Blackphone). The silent phone allows secure messages with your contacts, as well as free voice calls in HD audio, along with file transfers. Other features include a quick shutdown button and a delete function to remove all your personal data. 

8. Gliph

Gliph is available for Android, iOS and desktop PCs. Its secure messaging feature allows encryption via SSL and also supports secure deletion of messages. There is also a self-destruct feature for messages that can be set to expire after a certain time. Unlike other messengers, Gliph also supports secure group messages that allow you to talk securely with several people. In addition, Gliph supports Bitcoin payments that allow you to send (or receive) cash securely to (or from) contacts. Keep in mind, however, that the Gliph source code has not been published, nor has it been audited by any security expert, so there are no guarantees on this front.

9. Telegram

Telegram is not only a fast and simple messaging client, it also has an excellent "secret chats" feature. The conversations are encrypted and can only be accessed on the same device where the chat started. This application enjoyed some notoriety when it turned out that the Islamic State was apparently using Telegram to recruit followers.

10. Facebook Messenger

Like WhatsApp - as expected - Facebook uses the signal protocol to employ end-to-end encryption with its optional "secret chat" feature in Messenger Open Whisper Systems has confirmed that all this was implemented correctly.

After starting a secret conversation, you can send any content you have in a normal message, such as text, photo or video. Group messaging is not compatible.