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  Layering

Introduction to Layering

In this layered architecture, a number of layers are defined as shown in fig 5.26,

As it can be  seen  in the fig  5.26, that the  layers are hierarchical each layer provides  services to the one outside it, and acts as  a layer client to the inside it. In some  systems every layer has access to some or all the other layers. Whereas in  other systems a given  layer has access  only to its adjacent layers.  Now the  description  of  various  layers is given  below:

1. Cryptography Layer  is  the inner layer, includes functions  to encrypt and decrypt a key that is  used in the basic encryption scheme for the system.

2. File Interface Layer encrypts and decrypts a file.

3. Key Management Layer allows a component to sign for  file  verifies the signature and computes a hash code to gain access to the  file.

4. Authentication Layer  manages a password file that is stored in encrypted form  and it requests users to provide  identification and a password.

Advantages  of layering

Layered architectures use the notion of abstraction. So each layer can be considered to be an  increasing level of abstraction and  designers can use  the layers to  decompose a problem  into a sequence of abstract steps.

It is relatively easy to add  or modify  a layer as the need arises.

Disadvantages of layering

It is not always easy to structure a system layers.

 The system  performance  degrades due to  the extra  coordination among  layers.

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