All TeamViewer versions use full encryption. Encryption is based on 1024bit RSA private/public key exchange and 256 Bit AES session encoding. This uses the same security level as https/SSL and is considered completely safe by today's standards. They key exchange also guarantees that the data channel is completely encoded from client to client and that any routers or servers in between (including our routers) are unable to read or analyze the data stream. Security and privacy always been a top priority during development.
For additional information visit the TeamViewer TrustCenter page: