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 ciphersuite, 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 ciphersuite 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 ciphersuite 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.

Hash Algorithm:This part of the ciphersuite 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 ciphersuites available, yet different ciphersuites will affect the security level and the

performance of the secured connection.The information included in the ciphersuites 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 and TLSv1. 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.

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 ciphersuites available, yet different ciphersuites will affect the security level and the

performance of the secured connection.The information included in the ciphersuites 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 and TLSv1. 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.

Command

enable ssl

disable ssl

config ssl cachetimeout

show ssl

show ssl cachetimeout

download certificate_fromTFTP

Each command is listed, in detail, in the following sections.

Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch • Command Line Interface Reference Manual

Parameters

{ciphersuite {RSA_with_RC4_128_MD5 | RSA_with_3DES_EDE_CBC_SHA |