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Principle security

There are five principles of security. They are as follows:

· Confidentiality:

The principle of confidentiality specifies that only the sender and the intended recipient should be able to access the content of the message.


              Integrity:


The confidential information sent by A to B which is accessed by C without the permission or knowledge of A and B.
 

· Authentication:
Authentication mechanism helps in establishing proof of identification.

· Non-repudiation:

· Access control:
Access control specifies and control who can access what.

· Availability:
It means that assets are accessible to authorized parties at appropriate times.

Attacks
We want our security system to make sure that no data are disclosed to unauthorized

parties.
Data should not be modified in illegitimate ways
 Legitimate user can access the data

 · Passive attacks: does not involve any modification to the contents of an original message

   Active attacks: the contents of the original message are modified in some ways.

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