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The standard Internet communication protocol is completely unprotected, allowing hosts to inspect or modify data which is in transit. Adding IPSec to systems will overcome this limitation by providing strong encryption, integrity, authentication and replay protection. This paper describes IP security in details and explains theory, its mode of operation, security protocols and various services been provided, its application area along with various advantages and disadvantages. Internet communication has no data security built-in, i.e. the protocol is completely unprotected. The user data is been sent in clear text form, hence all the information can be seen by any person, organization, competitor etc. For example, the passwords are sent in the open and can be seen and used to hack the system.
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