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If you back up your phone, Signal doesn't store a copy of your messages, either. Aside from its cool name and funky design, Frozen Chat also offers end-to-end encryption with OTR (Off the Record) messaging.

This means that not only are your messages protected and you can verify who you're speaking to, but you also have deniability – anyone can forge a message after the conversation is over.

At this point, you might recall earlier this month there was a warning about a vulnerability in Whats App’s secure messages, but this was later proven to be false.

Whats App is available for both Android and i OS – you'll need to have a verifiable mobile phone number to register initially (it’s also available for desktop computers).

Although several security organisations have audited Wickr Me's code, it hasn't been released publicly so there's no way to check it for security bugs or deliberate backdoors.

It’s also not very clear how effectively the app can delete data, so Android users should be sure to encrypt their device, too.

When starting a conversation you will see a digital ‘fingerprint’ which you can check with your friend to make sure no one is intercepting messages.

Otherwise it can work just like a regular SMS application.

The source code for Signal is available online so security experts can constantly check it for vulnerabilities, too.

In fact Whats App uses some of Signal's source code for messaging.

In other words, it's impossible to prove any message was sent by you.

Frozen Chat is open source and also supports the open XMPP protocol which is used on thousands of servers.

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