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I have read that whatsapp is the least secure and that's before being acquired by Facebook, so now
it's probably worse

there is a new app called signal which looks ok but I not sure because I'm not an expert on encryption and decryption 
 

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Probably Telegram, works on OSX, ios, android, windows and probably linux too, you can bypass their servers and have a privately encrypted conversation if you want something extra secure too.

 

Edit: I want to add that it's really light weight, it's the only app that has never crashed on my android phone, it just seems really well made.

 

@warzkaz

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Well, any messenger that lets you control your encryption keys and also lets you send directly to the recipient is the safest. I don't trust the mainstream messengers to be safe because your data still has to pass through their servers and they have the encryption key and are able to use the data however they want.

 

I like WhisperPush, but that's for SMS messages. Last time I checked Telegram had a pretty solid encryption algorithm and it didn't do a man-in-the-middle thing. Hangouts is also supposed to be solid, but they won't really document how their encryption works so I can't vouch for it. If you're too paranoid though, you need to look into niche options, XDA is a good source.

 
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Well, any messenger that lets you control your encryption keys and also lets you send directly to the recipient is the safest. I don't trust the mainstream messengers to be safe because your data still has to pass through their servers and they have the encryption key and are able to use the data however they want.

 

I like WhisperPush, but that's for SMS messages. Last time I checked Telegram had a pretty solid encryption algorithm and it didn't do a man-in-the-middle thing. Hangouts is also supposed to be solid, but they won't really document how their encryption works so I can't vouch for it. If you're too paranoid though, you need to look into niche options, XDA is a good source.

I am from a country similar to north Korea, I have to be paranoid 

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I am from a country similar to north Korea, I have to be paranoid 

Go for Telegram then, and use secure chat, this will keep the conversation secret, and if you don't use the "conversation" for a set amount of time it will disappear forever. And by secret I mean that only you and the other person has the encryption key for that conversation.

 

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i would say whatsapp, since everyone uses it and there is already encryption

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I am from a country similar to north Korea, I have to be paranoid 

 

Telegram might be your best bet. I'll link a thread and an article from XDA forums that goes into more detail:

 

http://forum.xda-developers.com/showthread.php?t=2622542

http://www.xda-developers.com/keep-your-chats-private-with-telegram/

 

Also here's an article about Signal, I can't tell you more because I never heard of it till today:

 

http://www.xda-developers.com/cross-platform-encrypted-messaging-with-signal-2-0/

 

 

Happy reading :)

 
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I love telegram but I've read somewhere that BlackBerry Messenger is the most secure :\

Well that is because you needed your own server, which you own. I don't know how it is today, but Blackberry might keel over soon so... Telegram is open source and VERY up front about how their app works and how their encryption works, and it doesn't do anything else. It just sends text from A to B, and it was built from the ground up to be a secure messaging app.

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