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Question 161
The Advanced Encryption Standard (Rijndael) block cipher
requirements regarding keys and block sizes have now evolved to
which configuration?
requirements regarding keys and block sizes have now evolved to
which configuration?
Correct Answer: D
AES is comprised of the three key sizes, 128, 192, and 256 bits with
a fixed block size of 128 bits. The Advanced Encryption Standard
(AES) was announced on November 26, 2001 , as Federal Information
Processing Standard Publication (FIPS PUB 197). FIPS PUB 197 states
that This standard may be used by Federal departments and agencies
when an agency determines that sensitive (unclassified) information
(as defined in P.L. 100-235) requires cryptographic protection.
Other FIPS-approved cryptographic algorithms may be used in addition
to, or in lieu of, this standard. Depending upon which of the
three keys is used, the standard may be referred to as AES-128,
AES-192 or AES-256.
The number of rounds used in the Rijndael cipher is a function of
the key size as follows:
256-bit key 14 rounds
192-bit key 12 rounds
128-bit key 10 rounds
Rijndael has a symmetric and parallel structure that provides for
flexibility of implementation and resistance to cryptanalytic attacks.
Attacks on Rijndael would involve the use of differential and linear cryptanalysis.
a fixed block size of 128 bits. The Advanced Encryption Standard
(AES) was announced on November 26, 2001 , as Federal Information
Processing Standard Publication (FIPS PUB 197). FIPS PUB 197 states
that This standard may be used by Federal departments and agencies
when an agency determines that sensitive (unclassified) information
(as defined in P.L. 100-235) requires cryptographic protection.
Other FIPS-approved cryptographic algorithms may be used in addition
to, or in lieu of, this standard. Depending upon which of the
three keys is used, the standard may be referred to as AES-128,
AES-192 or AES-256.
The number of rounds used in the Rijndael cipher is a function of
the key size as follows:
256-bit key 14 rounds
192-bit key 12 rounds
128-bit key 10 rounds
Rijndael has a symmetric and parallel structure that provides for
flexibility of implementation and resistance to cryptanalytic attacks.
Attacks on Rijndael would involve the use of differential and linear cryptanalysis.
Question 162
Which of the following statements pertaining to the trusted computing base (TCB) is false?
Correct Answer: A
The ability of a TCB to correctly enforce a security policy depends solely on the
mechanisms within it and the correct input by system administrative personnel of parameters
related to security policy. For example, if Jane only has a "CONFIDENTIAL" clearence, a system
administrator could foil the correct operation of a TCB by providing input to the system that gave
her a "SECRET" clearence.
"It is defined in the Orange Book" is an incorrect choice. The TCB is defined in the Orange Book
(TCSEC or Trusted Computer System Evaluation Criteria).
"It includes hardware, firmware and software" is incorrect. The TCB does includes the combination
of all hardware, firmware and software responsible for enforcing the security policy.
"A higher TCB rating will require that details of their testing procedures and documentation be
reviewed with more granularity" is incorrect. As the level of trust increases (D through A), the level
of scrutiny required during evaluation increases as well.
References:
CBK, pp. 323 - 324, 329 - 330
AIO3, pp. 269 - 272,
mechanisms within it and the correct input by system administrative personnel of parameters
related to security policy. For example, if Jane only has a "CONFIDENTIAL" clearence, a system
administrator could foil the correct operation of a TCB by providing input to the system that gave
her a "SECRET" clearence.
"It is defined in the Orange Book" is an incorrect choice. The TCB is defined in the Orange Book
(TCSEC or Trusted Computer System Evaluation Criteria).
"It includes hardware, firmware and software" is incorrect. The TCB does includes the combination
of all hardware, firmware and software responsible for enforcing the security policy.
"A higher TCB rating will require that details of their testing procedures and documentation be
reviewed with more granularity" is incorrect. As the level of trust increases (D through A), the level
of scrutiny required during evaluation increases as well.
References:
CBK, pp. 323 - 324, 329 - 330
AIO3, pp. 269 - 272,
Question 163
Which of the following is NOT a type of motion detector?
Correct Answer: A
A photoelectric sensor does not "directly" sense motion there is a narrow beam that won't set off the sensor unless the beam is broken. Photoelectric sensors, along with dry contact switches, are a type of perimeter intrusion detector.
All of the other answers are valid types of motion detectors types.
The content below on the different types of sensors is from Wikepedia:
Indoor Sensors
These types of sensors are designed for indoor use. Outdoor use would not be advised due to false alarm vulnerability and weather durability.
Passive infrared detectors

Passive Infrared Sensor
The passive infrared detector (PIR) is one of the most common detectors found in household and small business environments because it offers affordable and reliable functionality. The term passive means the detector is able to function without the need to generate and radiate its own energy (unlike ultrasonic and microwave volumetric intrusion detectors that are "active" in operation). PIRs are able to distinguish if an infrared emitting object is present by first learning the ambient temperature of the monitored space and then detecting a change in the temperature caused by the presence of an object. Using the principle of differentiation, which is a check of presence or nonpresence, PIRs verify if an intruder or object is actually there. Creating individual zones of detection where each zone comprises one or more layers can achieve differentiation. Between the zones there are areas of no sensitivity (dead zones) that are used by the sensor for comparison.
Ultrasonic detectors
Using frequencies between 15 kHz and 75 kHz, these active detectors transmit ultrasonic sound waves that are inaudible to humans. The Doppler shift principle is the underlying method of operation, in which a change in frequency is detected due to object motion. This is caused when a moving object changes the frequency of sound waves around it. Two conditions must occur to successfully detect a Doppler shift event:
There must be motion of an object either towards or away from the receiver.
The motion of the object must cause a change in the ultrasonic frequency to the receiver relative to the transmitting frequency.
The ultrasonic detector operates by the transmitter emitting an ultrasonic signal into the area to be protected. The sound waves are reflected by solid objects (such as the surrounding floor, walls and ceiling) and then detected by the receiver. Because ultrasonic waves are transmitted through air, then hard-surfaced objects tend to reflect most of the ultrasonic energy, while soft surfaces tend to absorb most energy.
When the surfaces are stationary, the frequency of the waves detected by the receiver will be equal to the transmitted frequency. However, a change in frequency will occur as a result of the Doppler principle, when a person or object is moving towards or away from the detector. Such an event initiates an alarm signal. This technology is considered obsolete by many alarm professionals, and is not actively installed.
Microwave detectors
This device emits microwaves from a transmitter and detects any reflected microwaves or reduction in beam intensity using a receiver. The transmitter and receiver are usually combined inside a single housing (monostatic) for indoor applications, and separate housings (bistatic) for outdoor applications. To reduce false alarms this type of detector is usually combined with a passive infrared detector or "Dualtec" alarm.
Microwave detectors respond to a Doppler shift in the frequency of the reflected energy, by a phase shift, or by a sudden reduction of the level of received energy. Any of these effects may indicate motion of an intruder.
Photo-electric beams
Photoelectric beam systems detect the presence of an intruder by transmitting visible or infrared light beams across an area, where these beams may be obstructed. To improve the detection surface area, the beams are often employed in stacks of two or more.
However, if an intruder is aware of the technology's presence, it can be avoided. The technology can be an effective long-range detection system, if installed in stacks of three or more where the transmitters and receivers are staggered to create a fence-like barrier.
Systems are available for both internal and external applications. To prevent a clandestine attack using a secondary light source being used to hold the detector in a 'sealed' condition whilst an intruder passes through, most systems use and detect a modulated light source.
Glass break detectors
The glass break detector may be used for internal perimeter building protection. When glass breaks it generates sound in a wide band of frequencies. These can range from infrasonic, which is below 20 hertz (Hz) and can not be heard by the human ear, through the audio band from 20 Hz to 20 kHz which humans can hear, right up to ultrasonic, which is above 20 kHz and again cannot be heard. Glass break acoustic detectors are mounted in close proximity to the glass panes and listen for sound frequencies associated with glass breaking. Seismic glass break detectors are different in that they are installed on the glass pane. When glass breaks it produces specific shock frequencies which travel through the glass and often through the window frame and the surrounding walls and ceiling. Typically, the most intense frequencies generated are between 3 and 5 kHz, depending on the type of glass and the presence of a plastic interlayer. Seismic glass break detectors "feel" these shock frequencies and in turn generate an alarm condition.
The more primitive detection method involves gluing a thin strip of conducting foil on the inside of the glass and putting low-power electrical current through it. Breaking the glass is practically guaranteed to tear the foil and break the circuit.
Smoke, heat, and carbon monoxide detectors

Heat Detection System
Most systems may also be equipped with smoke, heat, and/or carbon monoxide detectors.
These are also known as 24 hour zones (which are on at all times). Smoke detectors and heat detectors protect from the risk of fire and carbon monoxide detectors protect from the risk of carbon monoxide. Although an intruder alarm panel may also have these detectors connected, it may not meet all the local fire code requirements of a fire alarm system.
Other types of volumetric sensors could be:
Active Infrared
Passive Infrared/Microware combined
Radar
Accoustical Sensor/Audio
Vibration Sensor (seismic)
Air Turbulence
All of the other answers are valid types of motion detectors types.
The content below on the different types of sensors is from Wikepedia:
Indoor Sensors
These types of sensors are designed for indoor use. Outdoor use would not be advised due to false alarm vulnerability and weather durability.
Passive infrared detectors

Passive Infrared Sensor
The passive infrared detector (PIR) is one of the most common detectors found in household and small business environments because it offers affordable and reliable functionality. The term passive means the detector is able to function without the need to generate and radiate its own energy (unlike ultrasonic and microwave volumetric intrusion detectors that are "active" in operation). PIRs are able to distinguish if an infrared emitting object is present by first learning the ambient temperature of the monitored space and then detecting a change in the temperature caused by the presence of an object. Using the principle of differentiation, which is a check of presence or nonpresence, PIRs verify if an intruder or object is actually there. Creating individual zones of detection where each zone comprises one or more layers can achieve differentiation. Between the zones there are areas of no sensitivity (dead zones) that are used by the sensor for comparison.
Ultrasonic detectors
Using frequencies between 15 kHz and 75 kHz, these active detectors transmit ultrasonic sound waves that are inaudible to humans. The Doppler shift principle is the underlying method of operation, in which a change in frequency is detected due to object motion. This is caused when a moving object changes the frequency of sound waves around it. Two conditions must occur to successfully detect a Doppler shift event:
There must be motion of an object either towards or away from the receiver.
The motion of the object must cause a change in the ultrasonic frequency to the receiver relative to the transmitting frequency.
The ultrasonic detector operates by the transmitter emitting an ultrasonic signal into the area to be protected. The sound waves are reflected by solid objects (such as the surrounding floor, walls and ceiling) and then detected by the receiver. Because ultrasonic waves are transmitted through air, then hard-surfaced objects tend to reflect most of the ultrasonic energy, while soft surfaces tend to absorb most energy.
When the surfaces are stationary, the frequency of the waves detected by the receiver will be equal to the transmitted frequency. However, a change in frequency will occur as a result of the Doppler principle, when a person or object is moving towards or away from the detector. Such an event initiates an alarm signal. This technology is considered obsolete by many alarm professionals, and is not actively installed.
Microwave detectors
This device emits microwaves from a transmitter and detects any reflected microwaves or reduction in beam intensity using a receiver. The transmitter and receiver are usually combined inside a single housing (monostatic) for indoor applications, and separate housings (bistatic) for outdoor applications. To reduce false alarms this type of detector is usually combined with a passive infrared detector or "Dualtec" alarm.
Microwave detectors respond to a Doppler shift in the frequency of the reflected energy, by a phase shift, or by a sudden reduction of the level of received energy. Any of these effects may indicate motion of an intruder.
Photo-electric beams
Photoelectric beam systems detect the presence of an intruder by transmitting visible or infrared light beams across an area, where these beams may be obstructed. To improve the detection surface area, the beams are often employed in stacks of two or more.
However, if an intruder is aware of the technology's presence, it can be avoided. The technology can be an effective long-range detection system, if installed in stacks of three or more where the transmitters and receivers are staggered to create a fence-like barrier.
Systems are available for both internal and external applications. To prevent a clandestine attack using a secondary light source being used to hold the detector in a 'sealed' condition whilst an intruder passes through, most systems use and detect a modulated light source.
Glass break detectors
The glass break detector may be used for internal perimeter building protection. When glass breaks it generates sound in a wide band of frequencies. These can range from infrasonic, which is below 20 hertz (Hz) and can not be heard by the human ear, through the audio band from 20 Hz to 20 kHz which humans can hear, right up to ultrasonic, which is above 20 kHz and again cannot be heard. Glass break acoustic detectors are mounted in close proximity to the glass panes and listen for sound frequencies associated with glass breaking. Seismic glass break detectors are different in that they are installed on the glass pane. When glass breaks it produces specific shock frequencies which travel through the glass and often through the window frame and the surrounding walls and ceiling. Typically, the most intense frequencies generated are between 3 and 5 kHz, depending on the type of glass and the presence of a plastic interlayer. Seismic glass break detectors "feel" these shock frequencies and in turn generate an alarm condition.
The more primitive detection method involves gluing a thin strip of conducting foil on the inside of the glass and putting low-power electrical current through it. Breaking the glass is practically guaranteed to tear the foil and break the circuit.
Smoke, heat, and carbon monoxide detectors

Heat Detection System
Most systems may also be equipped with smoke, heat, and/or carbon monoxide detectors.
These are also known as 24 hour zones (which are on at all times). Smoke detectors and heat detectors protect from the risk of fire and carbon monoxide detectors protect from the risk of carbon monoxide. Although an intruder alarm panel may also have these detectors connected, it may not meet all the local fire code requirements of a fire alarm system.
Other types of volumetric sensors could be:
Active Infrared
Passive Infrared/Microware combined
Radar
Accoustical Sensor/Audio
Vibration Sensor (seismic)
Air Turbulence
Question 164
A security evaluation report and an accreditation statement are produced in which of the following phases of the system development life cycle?
Correct Answer: D
The_answer: "acceptance phase". Note the question asks about an
"evaluation report" - which details how the system evaluated, and an "accreditation statement" which describes the level the system is allowed to operate at. Because those two activities are a part of testing and testing is a part of the acceptance phase, the only answer above that can be correct is "acceptance phase".
The other answers are not correct because:
The "project initiation and planning phase" is just the idea phase. Nothing has been developed yet to be evaluated, tested, accredited, etc.
The "system design specification phase" is essentially where the initiation and planning phase is fleshed out. For example, in the initiation and planning phase, we might decide we want the system to have authentication. In the design specification phase, we decide that that authentication will be accomplished via username/password. But there is still nothing actually developed at this point to evaluate or accredit.
The "development & documentation phase" is where the system is created and documented. Part of the documentation includes specific evaluation and accreditation criteria. That is the criteria that will be used to evaluate and accredit the system during the
"acceptance phase".
In other words - you cannot evaluate or accredit a system that has not been created yet. Of the four answers listed, only the acceptance phase is dealing with an existing system. The others deal with planning and creating the system, but the actual system isn't there yet.
Reference:
Official ISC2 Guide Page: 558 - 559
All in One Third Edition page: 832 - 833 (recommended reading)
"evaluation report" - which details how the system evaluated, and an "accreditation statement" which describes the level the system is allowed to operate at. Because those two activities are a part of testing and testing is a part of the acceptance phase, the only answer above that can be correct is "acceptance phase".
The other answers are not correct because:
The "project initiation and planning phase" is just the idea phase. Nothing has been developed yet to be evaluated, tested, accredited, etc.
The "system design specification phase" is essentially where the initiation and planning phase is fleshed out. For example, in the initiation and planning phase, we might decide we want the system to have authentication. In the design specification phase, we decide that that authentication will be accomplished via username/password. But there is still nothing actually developed at this point to evaluate or accredit.
The "development & documentation phase" is where the system is created and documented. Part of the documentation includes specific evaluation and accreditation criteria. That is the criteria that will be used to evaluate and accredit the system during the
"acceptance phase".
In other words - you cannot evaluate or accredit a system that has not been created yet. Of the four answers listed, only the acceptance phase is dealing with an existing system. The others deal with planning and creating the system, but the actual system isn't there yet.
Reference:
Official ISC2 Guide Page: 558 - 559
All in One Third Edition page: 832 - 833 (recommended reading)
Question 165
Which choice below is NOT an element of IPSec?
Correct Answer: C
The Layer Two Tunneling Protocol (L2TP) is a layer two tunneling protocol that allows a host to establish a virtual connection. Although L2TP, an enhancement to Layer Two Forwarding Protocol (L2F) and supporting some features of Point to Point Tunneling Protocol (PPTP), may coexist with IPSec, it is not natively an IPSec component. Answer a, the Authentication Header (AH), is an authenticating protocol that uses a hash signature in the packet header to validate the integrity of the packet data and the authenticity of the sender.
*the Security Association (SA), is a component of the IPSec architecture that contains
the information the IPSec device needs to process incoming and outbound IPSec packets. IPSec devices embed a value called the Security Parameter Index (SPI) in the header to associate a datagram with its SA, and store SAs in a Security Association Database (SAD).
*the Encapsulating Security Payload (ESP), is an authenticating and encrypting protocol that provides integrity, source authentication, and confidentiality services. Source: Implementing IPSec by Elizabeth Kaufman and Andrew Newman (Wiley, 1999).
*the Security Association (SA), is a component of the IPSec architecture that contains
the information the IPSec device needs to process incoming and outbound IPSec packets. IPSec devices embed a value called the Security Parameter Index (SPI) in the header to associate a datagram with its SA, and store SAs in a Security Association Database (SAD).
*the Encapsulating Security Payload (ESP), is an authenticating and encrypting protocol that provides integrity, source authentication, and confidentiality services. Source: Implementing IPSec by Elizabeth Kaufman and Andrew Newman (Wiley, 1999).
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