Your company has a special recipe for snack cakes. This snack cake is a key prod

Question

Your company has a special recipe for snack cakes. This snack cake is a key product in your company's lineup, and it is responsible for a large majority of shareholder value. Using a security model described in the text, describe an approach that will allow this important recipe to be kept secure.

Security can have a cumulative effect. Consider the OSI model as a key component of the Common Body of Knowledge. For definitions of OSI layers, click here: OSI Layers. What is the OSI model about, and how can we use it when we are selecting security controls?

Explanation / Answer

Networking is a prime concern for information security. The ubiquitous nature of network connectivity may let us access the world from our computer, but it also lets that same world gain access back to us in ways we may not desire.

OSI model

The OSI model depicts how data communications should take place. It splits the functions or processes into seven groups that are described as layers.

The OSI model defines standards for:

The seven layers of the OSI model are:

7.Application Layer

6.Presentation Layer

5.Session Layer

4.Transport Layer

3.Network Layer

2.Data-Link Layer

1.Physical Layer

7.The Application layer is the highest layer of the OSI model, and it provides the interface between the network protocol and the software running on the computer. The Application layer provides the necessary services that support applications.

     The common application protocols include:

6.The Presentation Layer’s primary responsibility is to define the syntax that network hosts use to communicate. Compression and encryption fall in the functions of this layer.

     The functions performed at the Presentation layer of the OSI are:

5.The Session Layer establishes process to process communications between two or more networked hostsThe Session layer utilizes the virtual circuits created by the Transport layer to establish communication sessions.

4.The Transport Layer is responsible for the delivery of messages between two or more networked hosts. It handles fragmentation and reassembly of messages and controls the reliability of a given link.

     The important functions performed at the Transport layer to enable network communication are listed below:

3.The Network Layer is primarily responsible for establishing the paths used for transfer of data packets between devices on the network.

The functions performed at the Network layer of the OSI model are listed below:

2.The Data-link layer of the OSI model enables the movement of data over a link from one device to another, by defining the interface between the network medium and the software on the computer.

     The responsibilities of the Data-link layer include:

1. The Physical Layer handles the bit level transmission between two or more network nodes.

The first layer in the OSI model is the Physical layer which transmits raw bit streams over a physical medium.

The details on the actual physical connection defined at this layer include:

security controls in different levels of OSI model

application layer      authentication

presentation layer    access control

session layer           non repudiation

transport layer          data integrity

network layer            confidentiality

data link layer           assurance/availability

physical layer            notarization/signature

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