CryptoCat, šifrovaný chat v browseru

Essentially, it’s a browser-based, open source alternative to traditional instant messaging and chat programs like Skype. Messages are encrypted in the browser with Javascript, sent encrypted across the internet to the client, and then decrypted in the client, using public key encryption to ensure that Cryptocat itself has no way of knowing what is sent, although its developer is careful to point out that Cryptocat, and third party observers, know that something is sent, and, unless the client is also using Tor (Cryptocat offers a hidden service at xdtfje3c46d2dnjd.onion), who is sending and receiving. To join a chat with someone else, simply go to a URL like “https://crypto.cat/?c=bitcoin”, substituting bitcoin with whatever name you want to give the chat, and tell someone else to go to the same page.

Even beyond its encryption, Cryptocat is superior to its traditional alternatives, like Skype, in some respects. No accounts or setup are required, so you can immediately set up a chat with anyone around the world without asking them to download a program first. There is no need to invite individual users to a large group chat; simply putting the URL in a common location will suffice.