https://github.com/positive-intentions/chat

probably not… but id like to share some details about how my app works so you can tell me what im missing. id like to have wording in my app to say something like “most secure chat app in the world”… i probably cant do that because it doesnt qualify… but i want to understand why?

im not a cyber security expert. im sure there are many gaps in my knowlege of this domain.

using javascript, i created a chat app. it is using peerjs-server to create an encrypted webrtc connection. this is then used to exchange additional encryption keys from cryptography functions built into browsers to add a redundent layer of encryption. the key exchange is done like diffie-helman (which can be considered secure when exchanged over public channels)

• i sometimes recieve feedback like “javascript is inherently insecure”. i disagree with this and have opened sourced my cryptography module. its basically a thin wrapper around vanilla crypto functions of a browser. a prev post on the matter.

• another concern for my kind of app (PWA) is that the developer may introduce malicious code. this is an important point for which i open sourced the project and give instructions for selfhosting. selhosting this app has some unique features. unlike many other selfhosted projects, this app can be hosted on github-pages and instructions are provided. im also working on introducing a way that users can selfhost federated modules. a prev post on the matter.

• to prevent things like browser extensions, the app uses strict CSP headers to prevent unauthorised code from running. selfhosting users should take note of this when setting up their own instance.

i think if stick to the principle of avoiding using any kind of “required” service provider (myself included) and allowing the frontend and the peerjs-server to be hosted independently, im on track for creating a chat system with the “fewest moving parts”. im hoping this will lead to true p2p and i hope i can use this as a step towards true privacy and security.

i created a threat-model for the app in hopes that i could get a pro-bono security assessment, but understandable the project is too complicated for pro-bono work.

i created a decentralized todo list demo using the p2p framework used in the chat app. this is to demonstrate the bare-minimum functionality of decentralised messaging and state management.

while there are several similar apps out there like mine. i think mine is distinctly a different approach so its hard to find best practices for the functionalities i want to achieve. in particular security practices to use when using p2p technology.