SENA STS Series - Manual (Page 52)

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Figure 4-9 Port IP filtering for serial ports
4.2.7. Cryptography Configuration
The STS Series supports encrypted sessions for only TCP mode including modem emulation mode
(not UDP mode).
4.2.7.1. Secure Sockets Layer(SSL) And Transport Layer Security(TLS) Cryptography Method
By setting the cryptography method as one of SSLv2, SSLv3, SSLv3 rollback to v2 or TLSv1, the STS
Series can communicate with other device supporting SSL/TLS cryptography method in encrypted
sessions.
SSL was developed by Netscape for use between clients and servers. SSL layers on top of any
transport protocol and can run under application protocols such as HTTP. SSL aims to be secure, fast,
and adaptable to other Web protocols. SSL provides data security for applications that communicate
across networks. SSL is a transport-layer security protocol layered between application protocols and
TCP/IP.
TLS is an updated version of SSL. The protocol is specified in an Internet RFC, developed under the
auspices of the Internet Engineering Task Force (IETF). TLS is an evolution of SSL and it specifies a
mechanism for falling back to SSL if either client or server does not support the newer protocol, so a
transition to TLS is relatively painless.
To initiate SSL/TLS sessions, exchange of messages called the SSL handshake is required between
two devices (Server and Client). The SSL/TLS protocol uses a combination of public-key and