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Printable Version: RFC2196.PDF
RFC 2196 Site Security Handbook September 1997
For example, your goals will probably be very different from the
goals of a product vendor. Vendors are trying to make configuration
and operation of their products as simple as possible, which implies
that the default configurations will often be as open (i.e.,
insecure) as possible. While this does make it easier to install new
products, it also leaves access to those systems, and other systems
through them, open to any user who wanders by.
Your goals will be largely determined by the following key tradeoffs:
(1) services offered versus security provided -
Each service offered to users carries its own security risks.
For some services the risk outweighs the benefit of the service
and the administrator may choose to eliminate the service rather
than try to secure it.
(2) ease of use versus security -
The easiest system to use would allow access to any user and
require no passwords; that is, there would be no security.
Requiring passwords makes the system a little less convenient,
but more secure. Requiring device-generated one-time passwords
makes the system even more difficult to use, but much more
secure.
(3) cost of security versus risk of loss -
There are many different costs to security: monetary (i.e., the
cost of purchasing security hardware and software like firewalls
and one-time password generators), performance (i.e., encryption
and decryption take time), and ease of use (as mentioned above).
There are also many levels of risk: loss of privacy (i.e., the
reading of information by unauthorized individuals), loss of
data (i.e., the corruption or erasure of information), and the
loss of service (e.g., the filling of data storage space, usage
of computational resources, and denial of network access). Each
type of cost must be weighed against each type of loss.
Your goals should be communicated to all users, operations staff, and
managers through a set of security rules, called a "security policy."
We are using this term, rather than the narrower "computer security
policy" since the scope includes all types of information technology
and the information stored and manipulated by the technology.
2.1.1 Definition of a Security Policy
A security policy is a formal statement of the rules by which people
who are given access to an organization's technology and information
assets must abide.
Fraser, Ed. Informational [Page 7]