Internet layer security protocol & IPsec

InternetLayer
Security
Protocol
By Prof. Kirti Ahirrao

Index:
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Prof. Kirti Ahirrao 2

Internet Layer Security Protocol :
• It derives its name from its function facilitating internetworking, which is the concept of
connecting multiple networks with each other through gateways.
• Internet Layer is used to provide internetworking.
• It provides group of internetworking methods, protocols and specifications in IP suite
• It is used for transport network packets.
• Internet-layer protocols use IP-based packets.

Function of Internet Layer:
1.
2.
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Types of
Protocol in
Internet Layer:
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IP sec : Internet
Protocol
Security
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Architecture of
IP sec:
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1.

Architecture of
IP sec:
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Architecture of
IP sec:
3.

Modes of Operations (IP sec Operations):
• It is divided into two modes :
1. Transport Mode
2. Tunnel Mode

1. Transport Mode
• In transport mode, only the payload of the IP packet is usually encrypted or authenticated.
• The routing is intact, since the IP header is neither modified nor encrypted; however, when
the authentication header is used, the IP addresses cannot be modified by network address
translation, as this always invalidates the hash value.
• The transport and application layers are always secured by a hash, so they cannot be
modified in any way, for example by translating the port numbers.
• A means to encapsulate IPsec messages for NAT traversal has been defined
by RFC documents describing the NAT-T mechanism.

2. Tunnel Mode
• In tunnel mode, the entire IP packet is encrypted and authenticated. It is then
encapsulated into a new IP packet with a new IP header. Tunnel mode is used to
create virtual private networks for network-to-network communications (e.g. between
routers to link sites), host-to-network communications (e.g. remote user access) and host-
to-host communications (e.g. private chat).
• Tunnel mode supports NAT traversal.

Internet Key
Exchange (IKE)
Protocol :
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Implementations
of IKE Protocol:
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Implementations
of IKE Protocol:
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Reference :
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Thankyou

Internet layer security protocol & IPsec

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