How To Integrate Pubnub In As The Secure Messaging Service

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Key Exchange System for Sending Encrypted Messages In this web log post, we'll cover how to build a key commutation system with PubNub, and one time we exercise and so, we'll exist able to ship encrypted messages between users.

Here's what nosotros've covered so far:

Role 1: Set upwardly a chat application and gave an overview of its architecture.
Part 3: Walked yous through how to send TLS encrypted chat letters.
Function Four: How to send self destructing chat letters
Function Five: Edifice a chatroom UI

This is a v office series on building Babel, an open source chat widget and API congenital with PubNub. Babel allows you to send and receive self destructing, encrypted messages and exchange 1024-bit RSA public keys in a chatroom.

We have a alive working Boom-boom self destructing chat demo here. You can also take a look at the source code on our Babel Github Repository. Now, let's go the tutorial started!

Building a Central Commutation System

Exchanging public keys is a primal component of Babel and developing cocky destructive messages. Once two users have exchanged public keys, they tin can then send encrypted letters to i another.

So how does Babel use PubNub to substitution public keys? Let's walkthrough how you can build your own key commutation organization with PubNub. key exchange

Step i: Import the PubNub JavaScript SDK

You lot'll beginning need to sign up for a PubNub account. Once you sign up, you can become your unique PubNub keys in the PubNub Developer Portal. And so, import the PubNub JavaScript SDK and to initialize PubNub with your unique keys, besides equally SSL enabled and withuuid set to a username that other users will exist able to identify us with..

Our next footstep is to get a public central to exist shared. For the purposes of this blog post, nosotros'll just use a random string to substitute for our public central. However, a more realistic public key string would exist something similar the Base64 encoding of an RSA public key.

After we get a public central, nosotros tin can share information technology with the PubNub Presence feature. To practise this, we first subscribe to a PubNub channel and prepare our state to an object that contains our username and public key.

Integrating PubNub Presence

PubNub Presence allows users to see who is online and offline, and updates in real time every bit users log on and off. After subscribing to a channel, other users will be able to come across our country with PubNub Presence.

here_now gets a list of unique user-ids currently subscribed to the aqueduct, the total occupancy of the channel, and too the state information of all users subscribed to the channel since we set state to truthful in our function telephone call.

The data returned past here_now to the callback will look something like this.

Thus, to get the state of all the users subscribed to the channel, you tin can loop through the uuids assortment from the the data returned by here_now.

Equally you lot can see, exchanging your public keys with PubNub is actually easy! However, nosotros're not done yet. In futurity blog posts we'll become over how to send encrypted letters and self-destructing messages through PubNub.