2025 HIGH HIT-RATE COPYRIGHT–100% FREE VALID STUDY MATERIALS | DETAILED COPYRIGHT STUDY PLAN

2025 High Hit-Rate copyright–100% Free Valid Study Materials | Detailed copyright Study Plan

2025 High Hit-Rate copyright–100% Free Valid Study Materials | Detailed copyright Study Plan

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ISC copyright Security Professional (copyright) Sample Questions (Q1493-Q1498):

NEW QUESTION # 1493
Which access control method is based on users issuing access requests on system resources, features assigned to those resources, the operational or situational context, and a set of policies specified in terms of those features and context?

  • A. Attribute Based Access Control (ABAC)
  • B. Role Based Access Control (RBAC)
  • C. Mandatory Access Control (MAC)
  • D. Discretionary Access Control (DAC)

Answer: B


NEW QUESTION # 1494
Which of the following protocol was used by the INITIAL version of the Terminal Access Controller Access Control System TACACS for communication between clients and servers?

  • A. SSH
  • B. SSL
  • C. TCP
  • D. UDP

Answer: D

Explanation:
Explanation/Reference:
Explanation:
TACACS has been through three generations: TACACS, Extended TACACS (XTACACS), and TACACS+.
TACACS combines its authentication and authorization processes; XTACACS separates authentication, authorization, and auditing processes; and TACACS+ is XTACACS with extended two-factor user authentication. TACACS uses fixed passwords for authentication, while TACACS+ allows users to employ dynamic (one-time) passwords, which provides more protection.
The original TACACS was developed during the days of ARPANET which is the basis for the Internet.
TACACS uses UDP as its communication protocol. TACACS+ uses TCP as its communication protocol.
Incorrect Answers:
A: TACACS uses UDP as its communication protocol, not TCP.
B: TACACS uses UDP as its communication protocol, not SSL.
D: TACACS uses UDP as its communication protocol, not SSH.
References:
Harris, Shon, All In One copyright Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 234 Jacobs, Josh, et al., SSCP Systems Security Certified Practitioner Study Guide and DVD Training System, Syngress, Rockland, 2003, p. 450
http://en.wikipedia.org/wiki/TACACS


NEW QUESTION # 1495
Which of the following vulnerability assessment activities BEST exemplifies the Examine method of assessment?

  • A. Ensuring that system audit logs capture all relevant data fields required by the security controls baseline
  • B. Performing Port Scans of selected network hosts to enumerate active services
  • C. Asking the Information System Security Officer (ISSO) to describe the organization's patch management processes
  • D. Logging into a web server using the default administrator account and a default password

Answer: A


NEW QUESTION # 1496
What is called the use of technologies such as fingerprint, retina, and iris scans to authenticate the individuals requesting access to resources?

  • A. Macrometrics
  • B. Biometrics
  • C. MicroBiometrics
  • D. Micrometrics

Answer: B

Explanation:
Source: KRUTZ, Ronald L. & VINES, Russel D., The copyright Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 35


NEW QUESTION # 1497
Which of the following cryptographic attacks describes when the attacker has a copy of the plaintext and the corresponding ciphertext?

  • A. brute force
  • B. chosen plaintext
  • C. known plaintext
  • D. ciphertext only

Answer: C

Explanation:
The goal to this type of attack is to find the cryptographic key that was used to encrypt the message. Once the key has been found, the attacker would then be able to decrypt all messages that had been encrypted using that key.
The known-plaintext attack (KPA) or crib is an attack model for cryptanalysis where the attacker has samples of both the plaintext and its encrypted version (ciphertext), and is at liberty to make use of them to reveal further secret information such as secret keys and code books. The term "crib" originated at Bletchley Park, the British World War II decryption operation
In cryptography, a brute force attack or exhaustive key search is a strategy that can in theory be used against any encrypted data by an attacker who is unable to take advantage of any weakness in an encryption system that would otherwise make his task easier. It involves systematically checking all possible keys until the correct key is found. In the worst case, this would involve traversing the entire key space, also called search space.
In cryptography, a ciphertext-only attack (COA) or known ciphertext attack is an attack model for cryptanalysis where the attacker is assumed to have access only to a set of ciphertexts.
The attack is completely successful if the corresponding plaintexts can be deduced, or even better, the key. The ability to obtain any information at all about the underlying plaintext is still considered a success. For example, if an adversary is sending ciphertext continuously to maintain traffic-flow security, it would be very useful to be able to distinguish real messages from nulls. Even making an informed guess of the existence of real messages would facilitate traffic analysis.
In the history of cryptography, early ciphers, implemented using pen-and-paper, were routinely broken using ciphertexts alone. Cryptographers developed statistical techniques for attacking ciphertext, such as frequency analysis. Mechanical encryption devices such as Enigma made these attacks much more difficult (although, historically, Polish cryptographers were able to mount a successful ciphertext-only cryptanalysis of the
Enigma by exploiting an insecure protocol for indicating the message settings).
Every modern cipher attempts to provide protection against ciphertext-only attacks. The vetting process for a new cipher design standard usually takes many years and includes exhaustive testing of large quantities of ciphertext for any statistical departure from random noise. See: Advanced Encryption Standard process. Also, the field of steganography evolved, in part, to develop methods like mimic functions that allow one piece of data to adopt the statistical profile of another. Nonetheless poor cipher usage or reliance on home- grown proprietary algorithms that have not been subject to thorough scrutiny has resulted in many computer-age encryption systems that are still subject to ciphertext-only attack.
Examples include:
Early versions of Microsoft's PPTP virtual private network software used the same RC4 key for the sender and the receiver (later versions had other problems). In any case where a stream cipher like RC4 is used twice with the same key it is open to ciphertext-only attack.
See: stream cipher attack
Wired Equivalent Privacy (WEP), the first security protocol for Wi-Fi, proved vulnerable to several attacks, most of them ciphertext-only.
A chosen-plaintext attack (CPA) is an attack model for cryptanalysis which presumes that the attacker has the capability to choose arbitrary plaintexts to be encrypted and obtain the corresponding ciphertexts. The goal of the attack is to gain some further information which reduces the security of the encryption scheme. In the worst case, a chosen-plaintext attack could reveal the scheme's secret key.
This appears, at first glance, to be an unrealistic model; it would certainly be unlikely that an attacker could persuade a human cryptographer to encrypt large amounts of plaintexts of the attacker's choosing. Modern cryptography, on the other hand, is implemented in software or hardware and is used for a diverse range of applications; for many cases, a chosen-plaintext attack is often very feasible. Chosen-plaintext attacks become extremely important in the context of public key cryptography, where the encryption key is public and attackers can encrypt any plaintext they choose.
Any cipher that can prevent chosen-plaintext attacks is then also guaranteed to be secure against known-plaintext and ciphertext-only attacks; this is a conservative approach to security.
Two forms of chosen-plaintext attack can be distinguished:
Batch chosen-plaintext attack, where the cryptanalyst chooses all plaintexts before any of them are encrypted. This is often the meaning of an unqualified use of "chosen-plaintext attack".
Adaptive chosen-plaintext attack, where the cryptanalyst makes a series of interactive queries, choosing subsequent plaintexts based on the information from the previous encryptions.
References:
Source: TIPTON, Harold, Official (ISC)2 Guide to the copyright CBK (2007), page 271.
and
Wikipedia at the following links:
http://en.wikipedia.org/wiki/Chosen-plaintext_attack
http://en.wikipedia.org/wiki/Known-plaintext_attack
http://en.wikipedia.org/wiki/Ciphertext-only_attac
http://en.wikipedia.org/wiki/Brute_force_attack


NEW QUESTION # 1498
......

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