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Руководство пользователя. Web UI Страница: 243

D-Link DWS-3160-24TC [243/505] Ssl settings

DWS-3160 Series Gigabit Ethernet Unified Switch Web UI Reference Guide

238

The fields that can be configured are described below:

Parameter Description

Old Local Enable

Password

If a password was previously configured for this entry, enter it here in order to change

it to a new password

New Local Enable

Password

Enter the new password that you wish to set on the Switch to authenticate users

attempting to access Administrator Level privileges on the Switch. The user may set a

password of up to 15 characters.

Confirm Local Enable

Password

Confirm the new password entered above. Entering a different password here from

the one set in the New Local Enabled field will result in a fail message.

Click the Apply button to accept the changes made.

SSL Settings

Secure Sockets Layer, or SSL, is a security feature that will provide a secure communication path between a host

and client through the use of authentication, digital signatures and encryption. These security functions are

implemented through the use of a cipher suite, which is a security string that determines the exact cryptographic

parameters, specific encryption algorithms and key sizes to be used for an authentication session and consists of

three levels:

1 Key Exchange: The first part of the Cipher suite string specifies the public key algorithm to be used. This

switch utilizes the Rivest Shamir Adleman (RSA) public key algorithm and the Digital Signature Algorithm

(DSA), specified here as the DHE DSS Diffie-Hellman (DHE) public key algorithm. This is the first

authentication process between client and host as they “exchange keys” in looking for a match and

therefore authentication to be accepted to negotiate encryptions on the following level.

2 Encryption: The second part of the cipher suite that includes the encryption used for encrypting the

messages sent between client and host. The Switch supports two types of cryptology algorithms:

Stream Ciphers – There are two types of stream ciphers on the Switch, RC4 with 40-bit keys and RC4 with

128-bit keys. These keys are used to encrypt messages and need to be consistent between client and host

for optimal use.

CBC Block Ciphers – CBC refers to Cipher Block Chaining, which means that a portion of the previously

encrypted block of encrypted text is used in the encryption of the current block. The Switch supports the

3DES EDE encryption code defined by the Data Encryption Standard (DES) to create the encrypted text.

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.

D-Link DWS-3160-24TC [243/505] Ssl settings

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