Network security model
A message
is to be transferred from sourced to destination across some sort of internet.
Figure shows network security model.
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| Figure: Network Security Model |
A logical
information channel is established by defining a route through the internet
from source to destination. All the techniques for providing security have two
components:
A
security related information to be sent.
Some
secret information shared by two parties; secret information is unknown to the
opponent.
A trusted
third party is needed to achieve secure transmission. For example, a third
party may be responsible for distributing the secret information to the two
parties (sender & receiver), also secret information protects from any
opponent.
Basic
tasks in designing a particular security service:
Design an
algorithm for performing the security related transformation.
Generate
the secret information to be used with the algorithm.
Develop
method for the distribution and sharing of the secret information.
Specify a protocol to be used by the two principles that makes use of the security algorithm and the secret information to achieve a particular security service.
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