An Introduction to Security in a CSM 1.3 for AIX 5L Environment

4 An Introduction to Security in a CSM 1.3 for AIX 5L Environment

Figure 1-2 Network firewall security

1.1.3 Data transmission security

Even when the internal network and the systems are secure, there is still the

concern for data transmitted over the network. You can have your data go to the

right place, but there could be eavesdropping (or listening) on the wire, and the

data transmitted could be copied.

To prevent eavesdropping, the data should be encrypted so that no one can

understand the data even if someone is listening. See 2.3, “Security

requirements and algorithm relationship” on page 18, for a more detailed

description of encryption methods.

It is important for confidential information, and particularly for financial

transactions, to keep the data private. Data security is especially important when

you are communicating over the public Internet. See Figure 1-3 on page 5.

Internet

Company

intranet

Firewall:

to protect

from "fire"

of Internet

Firewall "systems" can be

very elaborate - more

than one machine shown

Possible hacker