Military Communications and Information Technology: A Trusted ...

478 Military Communications and Information Technology...
weeks depending on number of couriers, number of served devices and devices
network topology. In the case of the electronic distribution, secure communication
infrastructure used to transfer of the data is available. So the time of the distribution
can be treat as negligible in this case.
The graphs presented in Fig. 2 show the example of timing dependencies
of the whole process of the data preparation in case of courier (1) and electronic
distribution (2).
The mutual proportions of the time of planning and time of generation can be
different depending on the applied method of the planning. However in the first
case their total time will certainly be much smaller than the time of courier distribution.
The efficiency of planning and generation have no bigger meaning, because
the distribution is the bottleneck.
In second case, the whole process of the data preparation become significantly
shorter. In this situation new profitable possibilities appear (presented
in Fig. 3): giving more time for analysis process and shortening the validity period.
The second solution increases security for data protection system. In both
solutions the planning is more effective because the needs for cryptographic
relations known at the beginning of planning are more adequate to real needs
existing in the moment of introducing the keys to use. In this case the planning
and generation become bottleneck.
It is necessary to determine if optimization of planning time and generation
time is possible. Let’s begin from generation process. The total time of generation
is equal to the product of generation time of single key and number of required
keys. The time of generation of single key follows from the property of random
generator and, for concrete solutions, is a fixed value. Let’s assume that generation
of one key lasts 1 second.
Figure 1. Life cycle of cryptographic data
Figure 2. Timing dependencies in process of data preparation