IP security

1. Prakash Ranjan
Roll- 34

2.  Ipsec is a suite of protocols designed
to protect data.
 Ipsec works by encrypting
information through encapsulation.
 Ipsec works at the network layer of
the open system interconnection
(OSI) model.

3.  Authentication- verifies that the packet
received is actually from the claimed
sender.
 Integrity- ensures that the contents of
the packet did not change in transit.
 Confidentiality-conceals the message
content through encapsulation.

4.  Data Tempering-The malicious
modification of data stored on web
sites or in databases or being passed
between two computers on a network.
 Network Traffic Sniffing- The capture
of network traffic by attackers looking
for important data files and to obtain
passwords.

5.  Ipsec Security method : Encapsulating
Security Payload(ESP) and
Authentication Header(AH).
 ESP-Ensures data confidentiality
through encryption , data integrity , and
authentication.
 AH-Provides data authentication and
integrity only . Does not support
encapsulation.

6.  Transport mode-The default mode .
It encrypts the ip payload.
 Tunnel mode-The more secure mode
. It encrypts the ip header and ip
payload.

8. Next Header – Next Header is the protocol identifies
the type of header immediately following the current
header.
Payload Length – the no of lines in the header is the
scenerio represents the payload length.
Reserved – it is reserved for future use.

9.  Security Parameter Index(SPI) – the no that identifies the
established communication between two system.
 Sequence No – it represents the no of message sent from the
sender to the receiver . The initial value of the counter is 1.It
is the sequence number of the packet.
 Authentication Data - The Authentication Data field contains
the result of the Integrity Check Value calculation, that can
be used by the receiver to check the authentication and
integrity of the packet.

11.  Padding – used to expand the encrypted field if
required or to conceal the actual length of the
payload.
 Pad Length – indicates the padding size.

12.  The Internet was not created with security .
 Communications can be altered, examined and
exploited.
 There is a growing need to protect private
information crossing the public networks that
make up the Internet infrastructure.
 IPSec is a set of protocols and methodologies to
create secure IP connections.

13.  IRACST – International Journal of Computer
Networks and Wireless Communications
(IJCNWC), ISSN: 2250-3501 Vol.2, No6,
December 2012
 International Journal of Scientific &
Engineering Research, Volume 5, Issue ś, Š¢-
2014 ISSN 2229-5518
 JOURNAL OF ADVANCES IN
INFORMATION TECHNOLOGY, VOL. 2, NO.
2, MAY 2011

14. Thank You.