Instant messaging (IM) is a form of communication over the Internet, that offers quick transmission of text-based messages from sender to receiver

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125
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5answers
119k views

Is Telegram secure?

There is a new WhatsApp-killer application called Telegram. They said that it's open source and that it has a more secure encryption. But they store all the messages in their servers and WhatsApp ...
18
votes
8answers
25k views

Which Instant Messaging services use or allow secure protocols, and what do those protocols cover?

We all know there's a myriad of Instant Messaging (IM) services out there. But, which of these services uses or permits protocols that actually secure your communications? For those that do, what ...
18
votes
2answers
10k views

The inner workings of iMessage security?

This is a very interesting article about the iMessage technology used in Apple's very popular communication devices. So far, there has not been much technical details released by Apple. Hopefully ...
17
votes
2answers
3k views

Are Playstation 4 communications really harder to monitor?

I have read on the net that authorities are having troubles monitoring Playstation 4 communications. As usual the news are very non technical. What makes the Playstation 4 network harder to ...
16
votes
1answer
1k views

How does end to end encryption work with whatsapp web?

Since today I have noticed whatsapp is using end to end encryption. However web.whatsapp.com is also still working. Does whatsapp establish a connection with my phone to keep things secure?
12
votes
5answers
19k views

Can Skype chat be protected from snooping? Are there safe alternatives?

I use Skype a lot. With all of my clients, staff, contractors and friends, however, the acquisition by Microsoft worries me, as two of my clients are direct MS competitors, and I often work on long ...
11
votes
5answers
3k views

Can voice chat be spied?

I wonder if voice chat (via public services like yahoo, google talk, skype, etc) is practically secure? Is it possible for the ISP or any middle point? I do not consider hacking the computers, but ...
11
votes
2answers
274 views

How does WhatsApp's new group chat protocol work and what security properties does it have?

By now everybody has noticed that WhatsApp rolled out full end-to-end encryption recently, for direct communication, for media attachments and for group chats. I've read their white-paper (PDF) and ...
10
votes
5answers
3k views

Is Skype secure enough to transmit passwords?

Is it considered "secure" to send a password in a skype message and delete the message after the recipient remembered the password?
8
votes
1answer
822 views

What are the main issues and best practice security controls when exposing SIP and H.323 to the Internet?

What are the main issues and recommended controls when exposing SIP and H.323 to the Internet (could be for voice, video, and instant messaging traffic or all three)? Specifically I'm looking for ...
7
votes
5answers
19k views

Does chatting over Skype expose my IP address?

Is there a way to identify a person's IP address in Skype, when you're chatting with them? Does this depend on their Skype settings? And if you've recorded chat messages, can they lead to the actual ...
7
votes
2answers
2k views

How is OTR messaging with Socialist Millionaire Protocol (SMP) protected from Man In The Middle?

So imagine the next situation: Alice wants to initiate OTR instant messaging session with Bob but Joe is Man In The Middle. Alice negotiates a shared secret 'X' with Joe (thinking he is Bob) using ...
7
votes
2answers
3k views

Are Telegram secret chats secure assuming MTProto isn't?

For those who don't know: Telegram is a partially open source Whatsapp alternative (Server is closed source) which offers secret chats and normal chats. Secret chats are encrypted with Diffie-Hellman ...
6
votes
5answers
2k views

Most Efficient way of Encrypted Chat

I'm creating a server where people can come and talk to each other. I'm mostly doing it for a fun project, here's my question. I'm using RSA for encryption/decryption, so only the clients will know ...
5
votes
3answers
1k views

Asymmetric Key Encryption in Group Chat

I am working on a chat application which supports both single user chat as well as group chat. We planned to encrypt messages in single user chat by public key of receiver and decrypt it using ...
5
votes
1answer
93 views

How was iMessage broken?

It was reported today that iMessage was broken (CVE-2016-1788) by a team from John Hopkins around Matthew Green. They said it was kinda to be expected after inspecting the security guide closely ...
4
votes
2answers
119 views

How to establish a random OTR remote party as a specific individual?

In reading Glenn Greenwald's 2014 book No place to hide, one thing stood out to me as a bit odd. Greenwald details how Edward Snowden was insistent that Greenwald install PGP in order to communicate ...
3
votes
1answer
312 views

What project is a good SILC substitute?

As time has marched on, it would appear that the Secure Internet Live Conferencing (SILC) client/toolkit have lost a bit of steam, I can't find any current mailing lists, their website doesn't seem to ...
3
votes
0answers
242 views

How Does Telegram's Identity Verification Work?

Note: please refrain from commenting on Telegram's design of OTHER parts, as it will distract from the stem of the question. Background: Signal (Previously, "TextSecure" app) uses specific "Your ...
2
votes
1answer
473 views

xmpp ssl cipher negotiation

Does anyone know how ssl ciphers are nogitiated via the xmpp protocol. When I capture packets, I see: <starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/> There is no hello server/client or ...
2
votes
1answer
181 views

Privacy issues when mobile app has access to phone number and contacts

It seems that when it comes to mobile apps convenience defeats security - always. In particular all messaging/communication apps seem to require to have access to your contacts on the phone and your ...
2
votes
1answer
128 views

Why is it possible to verify RedPhone inline while not OTR text apps?

Using RedPhone (the right way), one would call, establish a connection and read off the text verification on screen to the other party. If they match, it's ZRTP-secure, if it doesn't it's MITM'd. Why ...
2
votes
0answers
213 views

Does OtR require than IM applications remember multiple keys per contact? [closed]

I noticed the Guardian Project has developed a converter to move your off-the-record messaging keys between different IM applications. I'm curious what happens if your using multiple off-the-record ...
1
vote
3answers
2k views

Which real time cross-platform chat applications exist with end-to-end encryption?

I am looking for an instant messaging / chat application which can be used securely across different platforms, eg Windows, Linux, BSD! Do any exist?
1
vote
2answers
1k views

Is there any documentation or reviews about LINE messenger security?

I tried to find any documentation about the security of LINE messenger, but I couldn't. Is there any documentation or reviews about the communication protocol it uses, and whether or not it uses ...
1
vote
1answer
409 views

TextSecure/WhisperPush instant messaging by Open Whisper Systems: End-to-end encrypted or not?

Open Whisper Systems claims that its TextSecure messaging is end-to-end encrypted, but at the same time there are now some rather serious allegations of how it might be betraying its users. If I ...
1
vote
1answer
815 views

Are WhatsApp or Telegram secure enough to use for office communication?

We are thinking about switching from e-mail to instant messaging. Do you think, Apps like WhatsApp or Telegram provide enough security for that?
1
vote
1answer
4k views

How does wireshark detects online-messenger traffic?

I have been working on how to find use of online messenger (e.g imo.im, ebuddy) using wireshark. I'm doing , as i need to build SIEM (security information event management) use-cases which detects ...
1
vote
1answer
160 views

Private messages for an ios app - how secure is this system?

I'm designing architecture for sending private messages (i.e. only sender and receiver are able to read a message). Client side - iOS, server side - Parse.com I'm thinking of using RSA to ...
1
vote
2answers
204 views

How can I catch an Instant Messenger Identity Thief?

Here is the scheme. The identity thief logs in as my American friend in the instant messaging program QQ. (Did he steal her password or use some other exploit? I don't know.) The thief contact's ...
1
vote
3answers
3k views

How to intercept and analyze mobile SSL application traffic?

What is the best way to analyze requests sent by a mobile application over SSL? The communication protocol is not necessarily HTTP/S so intercepting them with BURP/ZAP/Fiddler or any other HTTP proxy ...
1
vote
0answers
120 views

WhatsApp end-to-end encryption for all devices [closed]

The news is out, WhatsApp switched on encryption for a billion people. It supports all devices and encrypts texts, photos, videos and calls. There are so many questions that just came to my mind ...
1
vote
1answer
101 views

Cloud-based IM protocols / services saving messages encrypted on server which is decryptable only by user? [closed]

I am looking for a cloud-based (i.e. not end-to-end) secure IM protocol or service. The first one comes to my mind is telegram. Here is a quote from telegram's privacy policy: Cloud Chats ...
1
vote
0answers
111 views

Has Stackfield been security audited and is the metadata safe?

It appears that Stackfield is one of the only functioning applications that combines end to end encryption, messaging services and file sharing. Peerio has just been launched (literally a day or two ...
1
vote
0answers
161 views

Instant Messaging End-to-End

I plan to create an application for secure instant messaging, now I don't know whether or not I want to implement the encryption by myself. This project is also mainly for educational purpose so I ...
1
vote
0answers
205 views

Does Diffie-Hellmann (DH) key exchange protocol lower Off-The-Record protocol (OTR) security level?

Off-the-Record protocol employes Diffie-Hellman key exchange protocol (DH). DH protocol does not provide authentication of the communicating parties and, according to many sources, is vulnerable to ...
1
vote
0answers
546 views

OTR and/or SecureIM library for C# .NET [closed]

I'm looking for implementations (or even wrappers) for OTR or SecureIM encrypted chat protocols usable from C#. Currently I found none, and considering porting Java OTR library and/or wrapping ...
1
vote
0answers
171 views

Are there any instant messaging systems that offer resistance to traffic analysis? [closed]

I'm happily using off-the-record messaging now, but I'd enjoy exploring more traffic analysis resistant options? It appears the most visible ones like Tor chat are rather stagnant, or at least don't ...
0
votes
2answers
200 views

Why does Telegram not use end-to-end encryption? [closed]

Signal and Telegram are both mobile applications that "try" to ensure secure chats. Signal uses end-to-end encryption, Telegram does this as well (in 'secret chats') but it does not use end-to-end ...
0
votes
2answers
149 views

Is hack.chat safe from packet sniffing?

So I recently found this tool called hack.chat. It's a disposable, browser-based IM system. If I were to use this at a friends house, public network, or at work, it is possible for someone on the ...
0
votes
1answer
68 views

How to encrypt something with a key? [closed]

I read a lot about security on the internet, especially how services like telegram work with their encryption and how they do it. I also heard of the Diffie-Hellman Key Exchange, which was quite ...
0
votes
2answers
113 views

Is End to End security possible without physical contact?

I noticed that a lot of messaging start to provide "End2End" security, but I wonder how this can be possible without a key exchange between the the two clients. To my understanding to provide real ...
-1
votes
1answer
221 views

Surespot versus government surveillance [closed]

Does anyone know how tight is surespot encryption? .. Does this the government a really hard time decrypting messages or is it simple like they would get it right away. .. Like imagine I was resisting ...
-1
votes
2answers
453 views

Why no one makes a message application like whatsapp using RSA keys?

I'm really new and I may sound like a noob so please forgive me. Since gnupg is avaible for android, why does no one makes an app that encrypts every message using a rsa key and just swap the keys ...
-2
votes
1answer
617 views

End-to-end WhatsApp vs Telegram [closed]

What do you think about the latest WhatsApp update? Is now WhatsApp as secure as Telegram? Which one should be trusted? Which one has the strongest and most secure encryption?
-3
votes
0answers
27 views

threema opensource client secure? [on hold]

i found a project that support the 'secure messaging client' "Threema" on linux (and even windows). (simple said, Threema is: like a secure Whatsapp Alternative from swizerland - further explanation: ...