Lecture10.pptx - Network and Internet Security Computer...

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edithcowancollege.edu.au navitas.com Network and Internet Security Computer Security
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edithcowancollege.edu.au navitas.com General Network Security Issues Not all networks are the same Can be different in terms of Size/complexity Topology Protocols Number of links to other networks Wired/wireless/combinations Devices used (switches, hubs, routers) Security requirements
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edithcowancollege.edu.au navitas.com Specific Network Security Issues The Internet of Things (IoT) Network security != privacy “Is someone watching you online? The security risks of the Internet of Things” http :// theconversation.com/is-someone-watching-you-online-the-security-risks-of-the-internet-of-things-55701
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edithcowancollege.edu.au navitas.com Transmission Control Protocol / Internet Protocol A set of protocols to allow hosts to communicate and exchange data over a private or public network TCP manages the assembly of a message into packets and data delivery IP manages the logical addressing of packets to ensure they reach the correct destination
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edithcowancollege.edu.au navitas.com Lack of Security in IPv4 IPv4 was design in early 1980s when security was not an area of concern TCP/IP was not created with security in mind No effective authentication of packet Vulnerable to packet spoofing/modification No standardised encryption of packets The use of NAT to defeat limited IP addresses has its own set of security issues
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edithcowancollege.edu.au navitas.com IPv6 IP Version 6 has been suggested as a solution to a number of problems IP address space exhaustion (128 bit address as opposed to 32 bit addresses) Encryption of packet data Cryptographic authentication of headers IPv6 seen by many as the answer to many of the inherent problems of IPv4
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edithcowancollege.edu.au IPv4 vs IPv6 IPv4 IPv6 IPv4 addresses are 32 bit length. IPv6 addresses are 128 bit length. IPv4 addresses are binary numbers represented in decimals. IPv6 addresses are binary numbers represented in hexadecimals . IPSec support is only optional. Inbuilt IPSec support. Fragmentation is done by sender and forwarding routers. Fragmentation is done only by sender. No packet flow identification. Packet flow identification is available within the IPv6 header using the Flow Label field. Checksum field is available in IPv4 header No checksum field in IPv6 header . Options fields are available in IPv4 header . No option fields, but IPv6 Extension headers are available. Address Resolution Protocol (ARP) is available to map IPv4 addresses to MAC addresses . Address Resolution Protocol (ARP) is replaced with a function of Neighbor Discovery Protocol (NDP) . Internet Group Management Protocol (IGMP) is used to manage multicast group membership.
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