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NEW QUESTION 33
A system has been scanned for vulnerabilities and has been found to contain a number of communication ports that have been opened without authority. To which of the following might this system have been subjected?
- A. Man-in-the-Middle (MITM)
- B. Denial of Service (DoS)
- C. Trojan horse
- D. Spoofing
Answer: C
NEW QUESTION 34
Which of the following biometric devices has the lowest user acceptance level?
- A. Retina Scan
- B. Hand geometry
- C. Signature recognition
- D. Fingerprint scan
Answer: A
Explanation:
Explanation/Reference:
Explanation:
Acceptability in terms of biometric systems refers to considerations of privacy, invasiveness, and psychological and physical comfort when using the system. For example, a concern with retina scanning systems may be the exchange of body fluids on the eyepiece or the feeling that a retinal scan could be harmful to the eye. Another concern would be the retinal pattern that could reveal changes in a person's health, such as diabetes or high blood pressure.
Incorrect Answers:
A: While requiring contact with a surface shared by others, a fingerprint scan is generally considered more acceptable than sharing a surface with other parts of the anatomy.
B: While requiring contact with a surface shared by others, a hand geometry scan is generally considered more acceptable than sharing a surface with other parts of the anatomy.
C: A signature does not involve contact with a surface shared by others and is therefore more acceptable than other biometric methods.
References:
Krutz, Ronald L. and Russell Dean Vines, The CISSP and CAP Prep Guide: Mastering CISSP and CAP, Wiley Publishing, Indianapolis, 2007, p. 60
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 191
https://sites.google.com/site/biometricsecuritysolutions/crossover-accuracy
NEW QUESTION 35
An access control policy for a bank teller is an example of the implementation of which of the following?
- A. user-based policy
- B. rule-based policy
- C. identity-based policy
- D. role-based policy
Answer: D
NEW QUESTION 36
The ANSI X9.52 standard defines a variant of DES encryption with keys
k1, k2, and k3 as:
C = Ek3 [Dk2 [Ek1 [M]]]
What is this DES variant?
- A. DESX
- B. Double DES with an encryption and decryption with different keys
- C. Triple DES in theEDE mode
- D. Triple DES in the EEE mode
Answer: C
Explanation:
This version of triple DES performs an encryption (E) of plaintext message M with key k1, a decryption (D) with key k2 (essentially, another encryption), and a third encryption with key k3. Another implementation of DES EDE is accomplished with keys k1 and k2 being independent, but with keys k1 and k3 being identical. This implementation of triple DES is written as: C = Ek1 [Dk2 [Ek1 [M]]] Answer a is incorrect since, in DESX, input plaintext is bitwise XORed with 64 bits of additional key material before encryption with DES, and the output of DES is also bitwise XORed with another 64 bits of key material. Answer b, DES in the EEE, mode is written as: C = Ek3 [Ek2 [Ek1 [M]]] where three consecutive encryptions are performed on plaintext message, M, with three independent keys, k1, k2, k3. Answer c is incorrect since the question contains three encryptions.
Implementing two DES encryptions does not provide the additional security anticipated over a single DES encryption because of the meet-in-the-middle attack. Consider a DES cipher with a key size of p. A double encryption will result in an effective key size of 2p and yield the final result R.Thus, one would anticipate that one would have to search a key space of 22p in an exhaustive search of the keys. However, it can be shown that a search of the key space on the order of 2p is all that is necessary. This search is the same size as required for a single DES encryption. This situation is illustrated as follows: The sequences shown illustrate the first DES encryption of a plaintext message M with all keys k1 through k2p yielding the intermediate encrypted results C1 through C2p. Ek1 [M] C1 Ek2 [M] C2
Ek2p [M] C2p If we have available ciphertext R where R = Ek2 [Ek1 [M]] for a pair of secret keys k1 and k2, for each key m there is only one key k such that Dm[R] = Ek[M] where D is the decipherment of R back from the second DES encipherment. In other words, there are 2p possible keys that will result in the pair [M,R] and, thus, can be found in a search of order 2p.
NEW QUESTION 37
Which of the following teams should not be included in an organization's contingency plan?
- A. Tiger team.
- B. Legal affairs team.
- C. Hardware salvage team.
- D. Damage assessment team.
Answer: A
Explanation:
In the computer industry, a tiger team is a group of programmers or users who volunteer or are hired to expose errors or security holes in new software or to find out why a computer network's security is being broken. In hiring or recruiting volunteers for a tiger team, some software developers advise others to be sure that tiger team members don't include crackers, who might use their special knowledge of the software to disable or compromise it in the future. We don't need a tiger team inside our contingency plan, however, we do need someone to assest the damage, the hardware and legal affairs.
NEW QUESTION 38
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