[StavrosK]

I don't know, Phil Zimmermann, Jon Callas et al are hardly known for bad crypto.

Full disclosure: I work for Silent Circle and it's pretty damn secure. It's also open-source: https://github.com/SilentCircle

[davexunit]

Are all of the silent circle applications free software? Do any of these applications depend on proprietary software to run?

[StavrosK]

They aren't developed in the open (they're opened up in certain releases), but the protocols themselves are open. The server software is proprietary, but the servers don't see any plain-text data.

[davexunit]

Ah. Proprietary servers are a dealbreaker for me.

[jessaustin]

Even if the protocol guarantees that they don't see unencrypted data? Do you feel the same way about all the internet relay servers between your client and the server?