Lantronix EDS-MD16, EDS-MD8, EDS-MD4 manual Security Settings, SSH Settings, SSH Server Host Keys

10: Security Settings

The EDS-MD4, EDS-MD8 and EDS-MD16 device supports Secure Shell (SSH) and Secure Sockets Layer (SSL). SSH is a network protocol for securely accessing a remote device. SSH provides a secure, encrypted communication channel between two hosts over a network. It provides authentication and message integrity services.

Secure Sockets Layer (SSL) is a protocol that manages data transmission security over the Internet. It uses digital certificates for authentication and cryptography against eavesdropping and tampering. It provides encryption and message integrity services. SSL is widely used for secure communication to a web server. SSL uses certificates and private keys.

Note: The device supports SSLv3 and its successors, TLS1.0 and TLS1.1. An incoming SSLv2 connection attempt is answered with an SSLv3 response. If the initiator also supports SSLv3, SSLv3 handles the rest of the connection.

SSH Settings

SSH is a network protocol for securely accessing a remote device over an encrypted channel. This protocol manages the security of internet data transmission between two hosts over a network by providing encryption, authentication, and message integrity services.

Two instances require configuration: when the EDS-MD is the SSH server and when it is an SSH client. The SSH server is used by the CLI (Command Mode) and for tunneling in Accept Mode. The SSH client is for tunneling in Connect Mode.

To configure the EDS-MD as an SSH server, there are two requirements:

Defined Host Keys: both private and public keys are required. These keys are used for the Diffie-Hellman key exchange (used for the underlying encryption protocol).

Defined Users: these users are permitted to connect to the EDS-MD SSH server.

SSH Server Host Keys

The SSH Server Host Keys are used by all applications that play the role of an SSH Server. Specifically Tunneling in Accept Mode. These keys can be created elsewhere and uploaded to the device or automatically generated on the device.

If uploading existing keys, take care to ensure the Private Key will not be compromised in transit. This implies the data is uploaded over some kind of secure private network.

Note: Some SSH Clients require RSA Host Keys to be at least 1024 bits in size.

	Table 10-1 SSH Server Host Keys
RSS Settings	Description
Private Key	Enter the path and name of the existing private key you want to upload. . In
	WebManager, you can also Browse to the private key to be uploaded. Be sure the
	private key will not be compromised in transit. This implies the data is uploaded over
	some kind of secure private network.

EDS-MD User Guide 58