D-Link DXS-3400 User Manual - Page 382

DXS-3400 Series Lite Layer 3 Stackable 10GbE Managed Switch Web UI Reference Guide SSH Client Settings This window is used to display and configure the SSH client settings. To view the following window, click Security > SSH >SSH Client Settings, as shown below: Figure 9-94SSH Client Settings Window The fields that can be configured are described below: Parameter Authentication Method Description Select the authentication method here. Options to choose from are: • Password - Specifies to use the password authentication method for this user account. This is the default authentication method. • Public Key - Specifies to use the public key authentication method for this user account. Enter the URL of a local file to be used as the public key of this user. Public Key File Path Private Key File Path Enter the pathand filename of the local file to be used as the public key here. Enter the pathof the local file to be used as the private key here. Click the Apply button to accept the changes made. SSL Secure Sockets Layer (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: • 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. • 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 and the Advanced Encryption Standard (AES). • 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 three hash algorithms, MD5 (Message Digest 5), SHA (Secure Hash Algorithm), and SHA-256. 372