7
C H A P T E R
Security
V
IRTUALLY
 every enterprise application exposed through a Web service has a
need for security at some level. An enterprise's data is an important asset to every
business, and a good security system is necessary to ensure its safety and integrity.
Businesses need to safeguard their systems and their data resources from malicious
use by unauthorized intruders, both internal and external to the business, and from
inadvertent or unintended mischief. Businesses also must keep message exchanges
with other entities secure.
Security for Web services is two fold: It encompasses both the security
requirements of a typical enterprise as well as the particular security needs of the
Web services themselves. An enterprise's business security requirements are well
known, and it is just as important to identify the security needs of a service. For
example, the developer of a Web service, after assessing its business needs, might
only want to let a certain set of users access particular resources. 
Setting up security also involves some usability issues. In particular, because
Web services have a high degree of interaction with varied clients, it is important
to keep security measures from being overly intrusive and thus maintain the ease
of use of a service. A service needs to promote its interoperability and make its
security requirements and policy known to clients. Often, a service needs to keep
a record of transactions or a log of access made to particular resources. The
service must not only guarantee privacy, but it must also keep these records in
case a claim is made at some later date about a transaction occurrence. 
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