By now, you should have a solid view of how cryptography works, but where and how does cryptography fit into a contemporary information system? Remember that the primary objectives of a cryptosystem are to provide the following security services, ideally in a cost-justified manner, balancing the need for security (required protection for the valuable information assets) with the cost of implementation.
Secure key distribution
This balance links to the risk assessment and information classification covered in Chapter 1 and the resulting policies that dictate what satisfactory protection is for each data element based on that classification. These policies define the strength ...