Seminar (network security)
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This document discusses network security. It covers topics such as why security is important given that the internet was initially designed for connectivity. It describes different types of security including computer, network, and internet security. It discusses security goals and common attacks targeting different layers such as IP, TCP, and DNS. The document also outlines security measures like firewalls, intrusion detection systems, access control, cryptography, public key infrastructure, and IPSec. It concludes with security management topics such as risk management and the Whois database.
Seminar (network security)
- 1. Network Security By Gaurav Dalvi Final Yr BTech Roll no:A43 Reg no:2011BCS501
- 2. Why Security? The Internet was initially designed for connectivity. Fundamental aspects of information must be protected. We can’t keep ourselves isolated from the Internet.
- 3. Internet Evolution •Different Ways to handle security as the Internet Evolves.
- 4. Type Of Security Computer Security generic name for the collection of tools designed to protect data and to thwart hackers Network Security measures to protect the data during the transmission. Internet Security measure to protect the data during the transmission over a collection of interconnected networks.
- 5. Goals of Information Security
- 6. Attacks on Different Layers
- 7. Security on Different Layers
- 8. IP IP is a network layer protocol. This is a layer that allows the hosts to actually “talk ” to each other. IP has a number of very important features which make it an extremely robust and flexible protocol.
- 9. Attacks on IP Attacks exploits the fact that IP does not perform a robust mechanism for authentication, which is proving that the packet came from where it claims it did. This means that the host authentication must be provided by higher layers. Eg: IP Spoofing, IP Session hijacking.
- 10. TCP Attacks Exploits TCP 3-way handshake. Attacker sends a series of SYN packets without replying with the ACK packet. Finite queue size for incomplete connections.
- 11. TCP Attacks
- 13. Common Type of Attacks Ping sweeps and port scans – reconnaissance. Sniffing – capture packet as they travel through the network. Man in the Middle Attack – intercept messages that are intended for a valid device. Spoofing – set up a fake device and trick others to send messages to it. Hijacking – take control of a session. Denial of Service (DoS) and Distributed DoS (DDoS).
- 14. Trusted Network Standard defensive-oriented technologies. - Firewall – first line of defense. - Intrusion Detection. Built trust on the top of the TCP/IP infrastructure. - Strong Authentication. - Two factor authentication. - something you have + something you know. - Public key Infrastructure.(PKI)
- 15. Firewall A choke point of control and monitoring. Interconnects networks with differing trust. Imposes restrictions on network services. only authorized traffic is allowed. Auditing and controlling access. can implement alarms for abnormal behavior. Itself immune to penetration. Provides perimeter defence.
- 16. Intrusion Detection System An intrusion detection system (IDS) is a device or software application that monitors network or system activities for malicious activities or policy violations and produces reports to a management station. Some systems may attempt to stop an intrusion attempt but this is neither required nor expected of a monitoring system. Host IDS. Network IDS.
- 17. Access Control Access Control – ability to permit or deny the use of an object by a subject. It provides 3 essential services (known as AAA): - Authentication.(who can login) - Authorization.(what authorized user can do) - Accountability.(identifies what a user did)
- 18. Cryptography Has evolved into a complex science in the field of information security. Encryption – process of transforming plaintext to ciphertext using a cryptographic key. Symmetric key cryptography. - DES, 3DES, AES, etc. Asymmetric key cryptography. - RSA, Diffie-Hellman, etc.
- 19. Cryptography
- 20. Public key Infrastructure Combines public key cryptography and digital signatures to ensure confidentiality, integrity, authentication, non-repudiation and access control. Digital Certificate – basic element of PKI; secure credential that identifies the owner. Basic Components:- Certificate Authority. - Registry Authority. - Repository. - Archives.
- 21. Different Layers of Encryption
- 22. IPSec Provides Layer 3 Security. Tunnel or Transport mode. - Tunnel mode(entire IP packet is encrypted) - Transport mode (IPSec header is inserted into the packet) Combine different components: - Security associations, Authentication headers (AH), Encapsulating security payload (ESP), Internet Key Exchange (IKE).
- 23. Security Management Loss Prevention. Loss prevention focuses on what your critical assets are and how you are going to protect them. Security risk management. Management of security risks applies the principles of risk management to the management of security threats. Risk options. Risk avoidance. Risk reduction. Risk spreading. Risk transfer. Risk acceptance.
- 24. Whois Database Public network Management Database. Tracks network Resources. - IP addresses, ASN, reverse routing. Records administrative info. - Contacts(person/role), authorization(maintainer) All members must register their resources in the Whois database. Must keep records up to date at all times.