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Chapter008

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Chapter008

  1. 1. Chapter 8 Physical Security
  2. 2. Objectives <ul><li>Manage the problems of dispersion and diversity </li></ul><ul><li>Factor the concept of secure space into a physical security scheme </li></ul><ul><li>Construct a security process using a security plan </li></ul><ul><li>Mitigate physical security threats </li></ul>
  3. 3. Physical Security <ul><li>Physical security safeguards assets from non-digital threats </li></ul><ul><ul><li>Protects information processing facilities and equipment from deliberate or accidental harm </li></ul></ul><ul><ul><li>More involved and complex </li></ul></ul><ul><ul><li>Essential to protecting information asset base </li></ul></ul><ul><li>Uncontrolled physical space makes it easy for an attacker to subvert most security measures </li></ul><ul><ul><li>Proximity to the equipment allows attackers to mount attacks more easily </li></ul></ul>
  4. 4. Problems of Dispersion and Diversity <ul><li>Physical security accounting and controlling processes have become more difficult with the advent of distributed systems </li></ul><ul><ul><li>Difficult to secure effectively because network resources are diverse and widely distributed </li></ul></ul><ul><ul><li>External parts of a network </li></ul></ul><ul><ul><ul><li>Telephone, cable lines, broadband interface </li></ul></ul></ul><ul><ul><li>Protection of less obvious non-computerized information repositories </li></ul></ul>
  5. 5. Problems of Dispersion and Diversity <ul><li>Collections of assets have different protection requirements </li></ul><ul><li>Establishing safeguards: </li></ul><ul><ul><li>Physical asset accounting framework that itemizes the physical records and resources </li></ul></ul><ul><ul><li>This framework requires maintaining a perpetual inventory of tangible assets as well as rules for controlling each asset </li></ul></ul><ul><ul><ul><li>Combination of a defined set of assets and the associated controls is called secure space </li></ul></ul></ul>
  6. 6. The Joy of Secure Space <ul><li>Safeguarding a facility requires deliberately creating a secure space </li></ul><ul><ul><li>Define physical perimeter or boundary </li></ul></ul><ul><ul><li>Deploy countermeasures to assure the security, confidentiality, and integrity of the items </li></ul></ul><ul><ul><li>Delineate the boundary of all controlled locations </li></ul></ul><ul><ul><li>Factors to be considered in establishing a secure space: </li></ul></ul><ul><ul><ul><li>Location </li></ul></ul></ul><ul><ul><ul><li>Access </li></ul></ul></ul><ul><ul><ul><li>Control </li></ul></ul></ul>
  7. 7. The Joy of Secure Space <ul><li>Factor 1: Ensuring the location </li></ul><ul><ul><li>Secure physical assets proportionate to the risks resulting from unauthorized access to that facility </li></ul></ul><ul><li>Factor 2: Ensuring controlled access </li></ul><ul><ul><li>Access is a privilege, which is individually assigned and enforced, rather than a right </li></ul></ul><ul><li>Factor 3: Ensuring control of secure space </li></ul><ul><ul><li>Based on the specification and enforcement of a set of behaviors that can be objectively monitored </li></ul></ul>
  8. 8. Physical Security Process and Plan <ul><li>Physical security process </li></ul><ul><ul><li>Guarantees that the effective safeguards are in place </li></ul></ul><ul><ul><li>Effectiveness is ensured by making certain that: </li></ul></ul><ul><ul><ul><li>Threats have been identified </li></ul></ul></ul><ul><ul><ul><li>Associated vulnerabilities have been accurately characterized, prioritized, and addressed </li></ul></ul></ul><ul><ul><li>Implemented through planning </li></ul></ul><ul><ul><li>Supervised and enforced by consistent and ongoing management </li></ul></ul>
  9. 9. Physical Security Process <ul><li>Identify the items to be protected </li></ul><ul><li>Three classes of items requiring assurance: </li></ul><ul><ul><li>Equipment – includes tangible things such as hardware and network connections </li></ul></ul><ul><ul><li>People – involves human resources and is part of the personnel security process </li></ul></ul><ul><ul><li>Environment – includes hazards associated with the environment as well as the safety requirements of the physical space </li></ul></ul>
  10. 10. Physical Security Plan <ul><li>Should be developed once an understanding of the threat environment has been developed </li></ul><ul><ul><li>Establishes a response to events that represent potential harm and that have a reasonable probability of occurrence </li></ul></ul><ul><ul><li>Responds to a threat by recommending the deployment of a set of countermeasures </li></ul></ul><ul><ul><li>Effective planning for all contingencies ensures efficient disaster recovery </li></ul></ul>
  11. 11. Physical Security Plan <ul><li>Ensuring effective planning </li></ul><ul><ul><li>Implemented through a formal, organization-wide plan aligned with both business and information assurance goals </li></ul></ul><ul><ul><li>Should specify the threats associated with the protected items in the secure space and specify countermeasures </li></ul></ul><ul><ul><li>Should be able to respond to all credible threats in advance </li></ul></ul><ul><ul><li>Establish controls to ensure that the secure space is not susceptible to intrusion and that sensitive materials are stored in secure containers </li></ul></ul><ul><ul><li>Should ensure that the organization responds effectively to natural disasters </li></ul></ul><ul><ul><li>Implementation plan is overseen by the audit function that monitors and enforces accountability </li></ul></ul>
  12. 12. Physical Security Plan <ul><li>Defense in-depth countermeasures </li></ul><ul><ul><li>Built around measures to extend the time it takes for a threat to cause harm </li></ul></ul><ul><ul><li>Involves design of the steps to detect, assess, and report probable physical threats or intrusions </li></ul></ul><ul><ul><li>In the threat assessment process, a decision has to be made about the probabilities of occurrence and harm </li></ul></ul><ul><ul><ul><li>The outcome of that assessment should produce a manageable set of threats, which are likely to occur for that particular space </li></ul></ul></ul>
  13. 13. Physical Security Targets and Threats <ul><li>It is important to factor four threat types into a comprehensive physical security plan: </li></ul><ul><ul><li>Facilities </li></ul></ul><ul><ul><li>Equipment </li></ul></ul><ul><ul><li>People </li></ul></ul><ul><ul><li>Environment </li></ul></ul>
  14. 14. Threats to the Facility <ul><li>Ensuring clean and steady power </li></ul><ul><ul><li>Power problems affect computers in three ways: </li></ul></ul><ul><ul><ul><li>Damage the hardware, causing downtime </li></ul></ul></ul><ul><ul><ul><li>Affect network availability – lost productivity </li></ul></ul></ul><ul><ul><ul><li>Result in a loss of data </li></ul></ul></ul><ul><ul><li>Potential infrastructure hazards to look for are: </li></ul></ul><ul><ul><ul><li>Voltage swings </li></ul></ul></ul><ul><ul><ul><li>Drains </li></ul></ul></ul><ul><ul><ul><li>Hazardous wiring </li></ul></ul></ul><ul><ul><li>Eliminating fluctuations </li></ul></ul><ul><ul><ul><li>Surge suppressors, Uninterruptible Power Supplies </li></ul></ul></ul><ul><ul><li>Ensure that access to physical controls is enforced </li></ul></ul>
  15. 15. Threats to the Facility <ul><li>Ensuring other building systems </li></ul><ul><ul><li>Ensure that other critical building systems are reliable such as: </li></ul></ul><ul><ul><ul><li>Heating </li></ul></ul></ul><ul><ul><ul><li>Ventilation </li></ul></ul></ul><ul><ul><ul><li>Air conditioning </li></ul></ul></ul><ul><ul><ul><li>Plumbing </li></ul></ul></ul><ul><ul><ul><li>Water supply systems </li></ul></ul></ul>
  16. 16. Safeguarding Equipment <ul><li>Physical security process safeguards tangible items, they include: </li></ul><ul><ul><li>Communication, processing, storage, and input or output devices </li></ul></ul><ul><li>Countermeasures assure safety and security </li></ul><ul><li>Conventional physical access control measures establish the integrity of controlled spaces </li></ul><ul><ul><li>Measures include locks, passcards, RFID, swipecard readers, video cameras, and safes </li></ul></ul><ul><ul><li>May also include human-based monitoring and control methods </li></ul></ul>
  17. 17. Safeguarding Equipment <ul><li>Protecting networks: ensuring integrity over a wide area </li></ul><ul><ul><li>Prevent unauthorized access </li></ul></ul><ul><ul><ul><li>Technical countermeasures for security include: </li></ul></ul></ul><ul><ul><ul><ul><li>Interruption sensors </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Line monitors </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Emanations security </li></ul></ul></ul></ul><ul><ul><li>Security failures on networks: </li></ul></ul><ul><ul><ul><li>Unauthorized users intercept information by physically accessing network equipment </li></ul></ul></ul><ul><ul><ul><li>If the network is unable to carry out its transmission functions </li></ul></ul></ul>
  18. 18. Safeguarding Equipment <ul><li>Protecting portable devices </li></ul><ul><ul><li>Problem of ubiquitous portability requires adherence to the following principles: </li></ul></ul><ul><ul><ul><li>Ensure that the device itself is always controlled </li></ul></ul></ul><ul><ul><ul><ul><li>Assign individual responsibility and enforce accountability for all portable devices </li></ul></ul></ul></ul><ul><ul><ul><li>Ensure that the data on the device is secure </li></ul></ul></ul><ul><ul><ul><ul><li>Ensure that sensitive data cannot be transported nor displayed without authorization and accountability </li></ul></ul></ul></ul><ul><ul><ul><li>Ensure controls that are provided to ensure security of a portable item are easy for end-users to follow </li></ul></ul></ul>
  19. 19. Controlling Access by People <ul><li>Effective access control requires: </li></ul><ul><ul><li>Designing a layered defense in the physical environment </li></ul></ul><ul><ul><li>Continuous monitoring and access control built in </li></ul></ul><ul><li>Heart of access control systems is the ability to: </li></ul><ul><ul><li>Grant convenient physical access to authorized people </li></ul></ul><ul><ul><li>Completely deny access to unauthorized ones </li></ul></ul>
  20. 20. Controlling Access by People <ul><li>Mechanisms for restricting physical access include: </li></ul><ul><ul><li>Perimeter controls </li></ul></ul><ul><li>Controls include restriction devices such as: </li></ul><ul><ul><li>Natural barriers </li></ul></ul><ul><ul><li>Fence systems </li></ul></ul><ul><ul><li>Walls </li></ul></ul><ul><ul><li>Supplemented with mechanical barriers </li></ul></ul><ul><ul><ul><li>Secure windows, doors, and locks </li></ul></ul></ul>
  21. 21. Controlling Access by People <ul><li>Perimeter controls: barriers </li></ul><ul><ul><li>Natural barriers </li></ul></ul><ul><ul><li>Structural barriers </li></ul></ul><ul><ul><ul><li>Fences define the secure areas and enforce entry only at designated points </li></ul></ul></ul><ul><ul><ul><li>Gates and bollards are part of the restriction system </li></ul></ul></ul><ul><ul><ul><li>Closed circuit television (CCTV) </li></ul></ul></ul><ul><ul><ul><li>Monitors which provide three levels of control: </li></ul></ul></ul><ul><ul><ul><ul><li>Detection – detects the presence of an object </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Recognition – determines the type of object </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Identification – determines the object details </li></ul></ul></ul></ul>
  22. 22. Controlling Access by People <ul><li>Perimeter controls: intrusion detection </li></ul><ul><ul><li>Ensures the integrity of a physical space </li></ul></ul><ul><ul><li>Monitors suspicious traffic, tracks intruders, and subsequently marks security holes discovered </li></ul></ul><ul><ul><li>Based on monitoring sensors and observing actions along the perimeter </li></ul></ul><ul><ul><li>Retrospective monitoring uses security logs or audit data to detect unauthorized accesses </li></ul></ul><ul><ul><li>Sensors installed at each access point establish perimeter protection </li></ul></ul>
  23. 23. Controlling Access by People <ul><li>Perimeter controls: guards and patrols </li></ul><ul><ul><li>Low-tech, labor-intensive approach to access control </li></ul></ul><ul><ul><ul><li>Provide an effective deterrent to unauthorized entry </li></ul></ul></ul><ul><ul><ul><li>Less expensive and no less reliable than automated systems </li></ul></ul></ul><ul><ul><ul><li>Not passive and cannot be disconnected or sabotaged as with high-tech solutions </li></ul></ul></ul><ul><ul><ul><li>They are subject to error </li></ul></ul></ul>
  24. 24. Controlling Access by People <ul><li>Perimeter controls: structural and mechanical barriers </li></ul><ul><ul><li>Doors and windows have to be strictly controlled since they are the most likely point of access </li></ul></ul><ul><ul><li>Considerations in determining which type of structure to be used: </li></ul></ul><ul><ul><ul><li>Whether to employ a hollow-core versus solid-core technology </li></ul></ul></ul><ul><ul><ul><li>How to identify and address hinge and doorframe vulnerabilities </li></ul></ul></ul><ul><ul><ul><li>Whether to monitor use through contact devices such as switches and pressure plates </li></ul></ul></ul>
  25. 25. Controlling Access by People <ul><li>Mechanical barrier devices: locks </li></ul><ul><ul><li>Most widely accepted and employed barrier device </li></ul></ul><ul><ul><li>Types of locks include: </li></ul></ul><ul><ul><ul><li>Cipher locks </li></ul></ul></ul><ul><ul><ul><li>Combination locks </li></ul></ul></ul><ul><ul><ul><li>Deadbolt locks </li></ul></ul></ul><ul><ul><ul><li>Smart locks </li></ul></ul></ul><ul><ul><li>Keys are the authentication tokens for locks: </li></ul></ul><ul><ul><ul><li>Security element rests with the control of keys </li></ul></ul></ul><ul><ul><ul><li>Most effective when used in a two-factor authentication system </li></ul></ul></ul><ul><ul><ul><ul><li>Example: with a door PIN </li></ul></ul></ul></ul>
  26. 26. Controlling Access by People <ul><li>Biometric systems </li></ul><ul><ul><li>An emerging authentication tool in physical access control </li></ul></ul><ul><ul><li>Based on exclusive physical attributes, which can be read and digitized </li></ul></ul><ul><ul><li>Can be used in conjunction with smart cards </li></ul></ul><ul><ul><li>Problem: scanning errors occur leading to false positives and false negatives </li></ul></ul>
  27. 27. Controlling Access by People <ul><li>Doubling the assurance: multiple factor authentication </li></ul><ul><ul><li>Uses of more than one form of authentication to control access; based on three broad categories: </li></ul></ul><ul><ul><ul><li>What you are (for example, biometrics) </li></ul></ul></ul><ul><ul><ul><li>What you have (for example, tokens) </li></ul></ul></ul><ul><ul><ul><li>What you know (for example, passwords) </li></ul></ul></ul><ul><ul><li>Simple multiple-factor authentication requires confirmation of at least two factors </li></ul></ul><ul><ul><li>Three-factor authentication combines three types </li></ul></ul>
  28. 28. Controlling Access by People <ul><li>Ensuring against the well-intentioned human being </li></ul><ul><ul><li>Accidents and non-intentional acts are the most frequent cause of human-based harm </li></ul></ul><ul><ul><ul><li>Proactive way to address human error is through training and drills </li></ul></ul></ul><ul><ul><ul><ul><li>Keeps people continuously aware of their security responsibilities </li></ul></ul></ul></ul><ul><ul><ul><ul><li>It has to be continuous to be effective </li></ul></ul></ul></ul><ul><ul><ul><li>Basic rule of thumb is a corollary to Murphy’s Law: </li></ul></ul></ul><ul><ul><ul><ul><li>A disaster plan is an appropriate countermeasure </li></ul></ul></ul></ul>
  29. 29. Mitigating the Effects of Natural Disasters and Fires <ul><li>Response or disaster planning is the primary means of assuring against the broad category of natural disasters </li></ul><ul><li>Disaster response countermeasures center on: </li></ul><ul><ul><li>Awareness </li></ul></ul><ul><ul><li>Anticipation </li></ul></ul><ul><ul><li>Preparation </li></ul></ul>
  30. 30. Mitigating the Effects of Natural Disasters and Fires <ul><li>Planning for fire prevention </li></ul><ul><ul><li>Computers and their components are extremely flammable devices </li></ul></ul><ul><ul><li>Three primary issues associated with fire protection: </li></ul></ul><ul><ul><ul><li>Prevention – reduction in the causes and sources </li></ul></ul></ul><ul><ul><ul><li>Detection – receiving a warning of fire </li></ul></ul></ul><ul><ul><ul><li>Suppression – extinguishing and containing a fire </li></ul></ul></ul>
  31. 31. Mitigating the Effects of Natural Disasters and Fires <ul><li>Preventing fires </li></ul><ul><ul><li>Good building design improves the chances of prevention </li></ul></ul><ul><ul><ul><li>The use of fire-resistant materials in walls, doors, and furnishings </li></ul></ul></ul><ul><ul><li>Reduce the number of combustible materials in the surrounding environment </li></ul></ul><ul><ul><li>Proactive approach to fire protection is fire-prevention awareness for employees </li></ul></ul><ul><ul><ul><li>Response drills such as a fire drill </li></ul></ul></ul>
  32. 32. Mitigating the Effects of Natural Disasters and Fires <ul><li>Fire detection </li></ul><ul><ul><li>Provides warning as close to the fire event as possible </li></ul></ul><ul><ul><ul><li>Most common are the ionization-type smoke detectors, which detect charged particles in smoke </li></ul></ul></ul>
  33. 33. Mitigating the Effects of Natural Disasters and Fires <ul><li>Fire detection (cont’d) </li></ul><ul><ul><li>Some kinds of non-equipment-related fires do not produce smoke </li></ul></ul><ul><ul><li>Two related types of detectors are: </li></ul></ul><ul><ul><ul><li>Photoelectric or optical detectors – react to light blockage caused by smoke particles </li></ul></ul></ul><ul><ul><ul><li>Heat sensing – react to the heat of a fire </li></ul></ul></ul><ul><ul><li>Downside in both methods – the fire has to be advanced enough to detect </li></ul></ul>
  34. 34. Mitigating the Effects of Natural Disasters and Fires <ul><li>Fire suppression </li></ul><ul><ul><li>The first line of defense is the fire suppression system </li></ul></ul><ul><ul><li>Having the right type of fire extinguisher </li></ul></ul><ul><ul><ul><li>Know that fire extinguishers have limited use </li></ul></ul></ul><ul><ul><ul><li>Halon is effective and it was the fire suppression agent of choice </li></ul></ul></ul><ul><ul><ul><li>FM200 (FM-200/heptafluoropropane) </li></ul></ul></ul><ul><ul><ul><ul><li>Extinguishes a fire by both robbing it of oxygen and by its physical suppression effect </li></ul></ul></ul></ul><ul><ul><ul><li>Water sprinkler system </li></ul></ul></ul>

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