
354 5.2 System Optimization for Exchange 2003
processing chips. Note that the SSL acceleration boards optimize the asym-
metric key required when the SSL session is established. Once the public
key/private key ciphering has been processed, the follow-on encryption
(typically, single to triple DES (Data Encryption Standard, a standardized
and commonly used encryption algorithm designed by IBM in the early
1970’s, and still in use in many encryption scenarios) is done by the server,
but this is far less expensive than the asymmetric key handling.
Figure 5.10 shows the benefits of using a single AXL accelerator card on
a front-end server handling SSL connections. ...