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Network security

Network security



The biggest threat to network security is underestimating the threat to network security. And as IP networks become the defector standard, ignoring this reality can extract a heavy price down the ...

The biggest threat to network security is underestimating the threat to network security. And as IP networks become the defector standard, ignoring this reality can extract a heavy price down the road.



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    Network security Network security Document Transcript

    • Network SecurityABSTRACT The biggest threat to network security is underestimating the threat to networksecurity. And as IP networks become the defector standard, ignoring this reality can extract aheavy price down the road. The truth of the matter is that current security technologies pose an unacceptable riskin protecting an organization’s data and intellectual property. Today’s firewall-based securitytechnologies do not fully protect data resources. Only data protection throughout the networkcan safeguard critical and confidential data, regardless of the success or failure of othersecurity technologies and policies. Therefore, data protection must be the primary layer ofdefense. As hacking and security threats grow in complexity and organizations face stringentrequirements to document access to private data on the network, organizations require a newlevel of network visibility and surveillance. The world of network security has become an “arms race”. As organizations tightentheir external defenses and install improved security tools, threats and attacks emerge tocircumvent these security measures. Increasingly, this arms race is taking place in a regulatedenvironment, where government rules such as HIPAA, Sarbanes-Oxley, and the EU DataProtection Directive require organizations to control access to private data and documentsecurity breaches. This includes the following. •Identify the need for a network security camera to capture and save all network transactions and activities •Illustrate how network security forensic appliances provide new visibility and evidence for security and compliance investigations •Highlight real-world examples from clients demonstrating the role network security forensics plays in identifying security and compliance violations •ProvidethekeycomponentstolookforinanynetworksecurityforensicssolutionNetwork security helps investigation.  Network policy violation.  Compliance violation
    •  Access violation  Security violationWhere network security is needed: •Monitoring internal threats •Documenting evidence for investigations •Solving the “Who done it” mystery •Complying with government regulations such as HIPAA, SOX, and the EU data Protection Directive •Complying with corporate HR and network- use policiesData in motion: what’s the worst that could happen? Networks today are not the isolated, self-contained islands they once were. Withinternet gateways giving network access to remote employees, customers, contractors andpartners, the network has opened up, increasing productivity and security risks. Network security has relied primarily on keeping the bad guys out. Hackers, thievesand other ne’er-do-wells seeking to do harm are prevented from getting in, most of the time.However, the nature of networks today is dynamic. While data may spend some time on anynumber of devices – servers, desktops, disk arrays – some of it is in motion, travelling acrossthe network, all the time. That data zipping around the network is the same data that isthoroughly protected while static. And it is more often than not completely unprotected whilein motion. Data residing on desktops, laptops and servers is usually protected with at least apassword, if not more complex security. While always a good idea, it should not be enough toensure a good night’s sleep for IT security. So much for perimeter defence and ID management as a comprehensive networksecurity strategy. There are any numbers of reasons your information may be an attractive target:• Intellectual property – your organization’s “special sauce” that gives you critical market differentiation and a leg up on the competition.• Customer information – personal, financial and/or health information can be very valuable. In fact, protecting that information has spawned a growing number of federal and stateregulations, including Gramm-Leach-Bliley, Sarbanes-Oxley and California Senate Bill 1386• Employee information – personal information such as Social Security numbers, bank account numbers and health information
    • • Other secret information – including governmental information regarding homeland or national security, Department of Defense activities or communications, and personal, private data used by any number of agencies• Business-enabling information – customer and prospect opportunities, plans and interactionsAll networks are untrusted Most enterprises and organizations with far-flung offices, remote back-up data centersand multiple buildings in a campus setting have a complex network to meet all of theircommunication and business needs. more than a single network, it is usually a network ofnetworks that must communicate and share data with one another. This creates a situationwhere data is physically leaving a protected facility and moving to another. Whether it’sgoing over the Internet, a service provider backbone or a wireless link between buildings, thatdata, which has been protected while at rest on servers, has moved out to where it is availableto anyone with the motivation and means to get it. If we take a look at a layered approach to network security, data protection, alongwith ID management and perimeter technologies, provide the three anchors that protect allaspects of the network: data and intellectual property, networking infrastructure and people.Examples of common networks where data in transit is susceptible to unauthorizedaccess.Broadband wireless link between buildings Many organizations have multiple networks in different facilities that must exchangeinformation. When fibre is impossible or too cost-prohibitive, high-speed wireless provides
    • an inexpensive and easy solution. However, all data transmitted over the air through thewireless links is at risk to anyone wanting to access it.Broadband wireless link between buildingsStorage IP Networking It is becoming increasingly common for organizations to store and archive their datain a remote facility. Once again, however, this data must travel over entrusted networks toreach its destination, meaning it could be accessed without anyone knowing it.MPLS MPLS (multi-protocol label switching) networks are becoming more and morepopular as service providers look for ways to enable multiple customers to have VPNs on thesame network. However, the VPNs on the MPLS network simply separate user groups, theydon’t protect the data.
    • Data protection – the primary layer of defense Your data is running around the network in packets that contain addresses, protocolids, and the actual data. If you protect the packet from its source to its destination you havecreated an excellent foundation for a secure network. There are three main aspects of data protection on the network: • Confidentiality – Keep your data private • Authentication – Trust your sources • Integrity—Trust your data IP Security (IPSec), defined by the Internet Engineering Task Force (IETF), is theaccepted standard for protecting data in transit over an untrusted network and provides thethree levels of security. IPSec is a suite of security protocols that protects IP packets. IPSec works on Layer 3, the network layer of the Open Systems interconnection 7-layer networking model. By running on Layer 3, IPSec is able to function transparently tohigher layer applications; the applications do not require any knowledge of IPSec in order touse it. By enabling IPSec everywhere on the network that sensitive data travels, thevulnerability of data traveling in the clear is eliminated.IPSec modes of protection IPSec protects IP packets by defining which traffic is to be protected, IPSec uses aprotocol called Encapsulating Security Payload (ESP) that provides proof of data integrity,data source authentication and anti-replay by inserting a new IP address and ESP header in
    • front of the packet to be protected. This protects the entire IP packet including the originatingIP address. Using ESP controls both the encryption and authentication used to protect the IPpayload.Tunnel modeESP (encapsulating security payload)_ Data integrity + authentication_ Anti-replay service_ ConfidentialityIPSec encryption IPSec encryption enables confidentiality of data as it travels on the network. • Uses symmetric keys (same keys are used for encryption and decryption) • Uses Diffie-Hellman algorithms and IKE/ISAKMP protocols to derive keys • Encryption algorithms such as AES(Advanced Encryption Standard)Cipher Optics enables IPSec everywhere There are several ways to enable IPSec on the network. The Cipher Optics approachis to use purpose-built appliances designed for Fast Ethernet and Gigabit Ethernet IPnetworks. With its proprietary TILEA™ architecture, Cipher Optics appliances are pavingthe way for IPSec everywhere.
    • To show how Cipher Optics IPSec appliances provide data protection is shown infigure below,Internet Key Exchange (IKE) IKE is used to ensure security for virtual private network negotiation and remote hostor network access. IKE defines an automatic means of negotiation and authentication forIPSec security associations (SA). Security associations are security policies defined forcommunication between two or more entities¾the relationship between the entities isrepresented by a key. The IKE protocol ensures security for SA communication without thepre-configuration that would otherwise be required.
    • ConclusionNew security tools will continue to emerge to combat constantly evolving security threats.There will never be a single “set it and forget it” security solution for stopping breaches onthe network. To effectively address and prevent security breaches requires constantmonitoring and adjusting of infrastructure and policy. If a successful attack is perpetratedagainst an organization, the monitoring solution becomes even more critical to ensure theattack is accurately identified and appropriate steps are taken to prevent future attacks.Network security forensic devices are uniquely positioned to provide a full view of allactivities before, during, and after the event. These tools also have the ability to isolate thebreach, identify software, scripts and exploits used; and locate potentially compromisedinfrastructure. The ability to capture all packet-level data is also critical to compliance enforcementand the documentation of potential violations. The ability to accurately diagnose the breachor policy violation through reports and reconstructing communications or web sessionsprovides evidence necessary for proving compliance.