H3C Technologies H3C SecBlade LB Cards - Manual (Page 160)

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Configuring SSL
Secure Sockets Layer (SSL) can be configured only at the CLI.
Overview
Secure Sockets Layer (SSL) is a security protocol that provides secure connection services for TCP-based
application layer protocols such as HTTP. It is widely used in e-business and online banking to provide
secure data transmission over the Internet.
SSL security mechanism
Secure connections provided by SSL have these features:
• Confidentiality—SSL uses a symmetric encryption algorithm to encrypt data and uses the
asymmetric key algorithm of RSA to encrypt the key to be used by the symmetric encryption
algorithm.
• Authentication—SSL supports certificate-based identity authentication of the server and client by
using the digital signatures. The SSL server and client obtain certificates from a CA through the PKI.
• Reliability—SSL uses the key-based message authentication code (MAC) to verify message integrity.
A MAC algorithm transforms a message of any length to a fixed-length message. With the key, the
sender uses the MAC algorithm to compute the MAC value of a message. Then, the sender
appends the MAC value to the message and sends the result to the receiver. The receiver uses the
same key and MAC algorithm to compute the MAC value of the received message, and compares
the locally computed MAC value with that received. If the two values match, the receiver considers
the message intact; otherwise, the receiver considers that the message has been tampered with in
transit and discards the message.
Figure 70 Message integrity verification by a MAC algorithm
For more information about symmetric key algorithms, asymmetric key algorithm RSA and digital
signature, see "Managing public keys."
For more information about PKI, certificate, and CA, see "Configuring PKI."