1.Introduction

National Security Agency (NSA) and Linux community has developed the access
control architecture to processes to only the files they need to complete
their actions. This architecture is called security-enhanced Linux(SELinux).

2.Definition

Security Enhanced linux is a concept which is used to enhance the security of
the operating system (i.e kernel)

3.Concepts

The Security Enhanced concepts provides support to kernel as,

1.Access control policies
2.Type enforcement
3.Role based Access control
4.Multi level Security.

2.1 Mandatory access control policies:

The administrator which defines the policy, user cannot modify that policy. It
states that which subject has to access which object. Thus security is
enhanced more.

2.2 Type enforcement policies:

Implementing type enforcement will give priority to the Madatory Access
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