D-Link Xstack DES-3528 Series Reference Manual page 280

xStack® DES-3528/DES-3552 Series Layer 2 Managed Stackable Fast Ethernet Switch Web UI Reference Guide
3. Hash Algorithm: This part of the cipher suite allows the user to choose a message digest function which
will determine a Message Authentication Code. This Message Authentication Code will be encrypted with a
sent message to provide integrity and prevent against replay attacks. The Switch supports two hash
algorithms, MD5 (Message Digest 5) and SHA (Secure Hash Algorithm).
These three parameters are uniquely assembled in four choices on the Switch to create a three-layered encryption
code for secure communication between the server and the host. The user may implement any one or combination
of the cipher suites available, yet different cipher suites will affect the security level and the performance of the
secured connection. The information included in the cipher suites is not included with the Switch and requires
downloading from a third source in a file form called a certificate. This function of the Switch cannot be executed
without the presence and implementation of the certificate file and can be downloaded to the Switch by utilizing a
TFTP server. The Switch supports SSLv3. Other versions of SSL may not be compatible with this Switch and may
cause problems upon authentication and transfer of messages from client to host.
The SSL Settings window located on the next page will allow the user to enable SSL on the Switch and implement
any one or combination of listed cipher suites on the Switch. A cipher suite is a security string that determines the
exact cryptographic parameters, specific encryption algorithms and key sizes to be used for an authentication
session. The Switch possesses four possible cipher suites for the SSL function, which are all enabled by default.
To utilize a particular cipher suite, disable the unwanted cipher suites, leaving the desired one for authentication.
When the SSL function has been enabled, the web will become disabled. To manage the Switch through the web
based management while utilizing the SSL function, the web browser must support SSL encryption and the header
of the URL must begin with https://. (Ex. https://xx.xx.xx.xx) Any other method will result in an error and no access
can be authorized for the web-based management.
Users can download a certificate file for the SSL function on the Switch from a TFTP server. The certificate file is a
data record used for authenticating devices on the network. It contains information on the owner, keys for
authentication and digital signatures. Both the server and the client must have consistent certificate files for optimal
use of the SSL function. The Switch only supports certificate files with .der file extensions. Currently, the Switch
comes with a certificate pre-loaded though the user may need to download more, depending on user
circumstances.
To view this window, click Security > SSL Settings, as shown below:
To set up the SSL function on the Switch, configure the parameters in the SSL Settings section described.
Figure 8-68 SSL Settings window
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