Allied-telesis AT-S60 Manual do Utilizador descarregar pdf (Página 384)

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AT-S60 Management Software User’s Guide

Section III: Security Features 383

The Alert message is used if the client or server detects an error. Alert

messages also inform the other end that the session is about to close. In

addition, the Alert message contains a severity rating and a description

of the alert. For example, an alert message is sent if either party receives

an invalid certificate or an unexpected message.

The Application data message encapsulates the encrypted application

data.

Authentication Authentication is the process of ensuring both the web site and the end

user are genuine. In other words, they are not imposters. Both the server

and an individual users need to be authenticated. This is especially

important when transmitting secure data over the Internet.

To verify the authenticity of a server, the server has a public and private

key. The public key is given to the user.

SSL uses certificates for authentication. A certificate binds a public key to

a server name. A Certification Authority issues certificates after checking

that a public key belongs to its claimed owner. There are several

agencies that are trusted to issue certificates. Individual browsers have

approved Root CAs that are built in to the browser.

Note

See Public Key Infrastructure Overview on page 358 for detailed

information about certificates.

Support for SSL The AT-8400 switch implements the following versions of SSL:

❑ Mandatory parts of RFC 2246 (TLSv1), except for DSS encryption

❑ Mandatory parts of SSLv3

❑ SSLv2 client hello

❑ SHA1 for MAC

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