For video-calling there aren't that many except Jitsi, but I suspect there will be more encrypted WebRTC web apps soon.

For mobile there's SilentCircle, but it's $20 a month or something.

Would it be possible to dll inject skype and automatically encrypt all text / video between you and another person running the same injected dll?

I imagine that's against TOS or something though. I've just always wondered if it was possible.

I'm sure it is possible, but keeping it from breaking with every release is going to be tricky.

Plus one of Skype's benefits is that it works on "everything" (Windows, Linux, Mac, Android, iOS, etc); so your solution is only as good as the platforms you can tag.

You could as well use an external tool to en/decrypt your text with for example blowfish + base64 encoding and use Skype just as the transportation layer of the encrypted messages.

Jitsi is one.

silent circle