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NEW QUESTION 47
What type of wiretapping involves injecting something into the communications?
- A. Aggressive
- B. Passive
- C. Active
- D. Captive
Answer: C
Explanation:
Most communications are vulnerable to some type of wiretapping or eavesdropping. It can usually be done undetected and is referred to as a passive attack versus an active attack. -Shon Harris All-in-one CISSP Certification Guide pg 649 "(I) An attack that intercepts and accesses data and other information contained in a flow in a communication system. (C) Although the term originally referred to making a mechanical connection to an electrical conductor that links two nodes, it is now used to refer to reading information from any sort of medium used for a link or even directly from a node, such as gateway or subnetwork switch. (C) "Active wiretapping" attempts to alter the data or otherwise affect the flow; "passive wiretapping" only attempts to observe the flow and gain knowledge of information it contains. (See: active attack, end-to-end encryption, passive attack.)" http://www.linuxsecurity.com/dictionary/dict-455.html
NEW QUESTION 48
Complete the following sentence. A digital signature is a:
- A. senders signature signed and scanned in a digital format
- B. hash value that has been encrypted with the sender's private key
- C. hash value that has been encrypted with the senders Session key
- D. hash value that has been encrypted with the sender's public key
Answer: B
Explanation:
Explanation/Reference:
Explanation:
A digital signature is a hash value that was encrypted with the sender's private key.
Digital signatures are based on public key cryptography, also known as asymmetric cryptography. Using a public key algorithm such as RSA, one can generate two keys that are mathematically linked: one private and one public. To create a digital signature, signing software (such as an email program) creates a one- way hash of the electronic data to be signed. The private key is then used to encrypt the hash. The encrypted hash -- along with other information, such as the hashing algorithm -- is the digital signature.
The reason for encrypting the hash instead of the entire message or document is that a hash function can convert an arbitrary input into a fixed length value, which is usually much shorter. This saves time since hashing is much faster than signing.
Incorrect Answers:
B: The hash value is signed with the sender's private key, not the public key to prove that the message came from the sender and has not been altered in transit.
C: A session key is not used to encrypt the hash value in a digital signature.
D: A digital signature is not a sender's signature signed and scanned in a digital format.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 829
http://searchsecurity.techtarget.com/definition/digital-signature
NEW QUESTION 49
Which security model introduces access to objects only through programs?
- A. The Bell-LaPadula model
- B. The Biba model
- C. The Clark-Wilson model
- D. The information flow model
Answer: C
Explanation:
In the Clark-Wilson model, the subject no longer has direct access to objects but
instead must access them through programs (well -formed transactions).
The Clark-Wilson integrity model provides a foundation for specifying and analyzing an integrity
policy for a computing system.
The model is primarily concerned with formalizing the notion of information integrity. Information
integrity is maintained by preventing corruption of data items in a system due to either error or
malicious intent. An integrity policy describes how the data items in the system should be kept
valid from one state of the system to the next and specifies the capabilities of various principals in
the system. The model defines enforcement rules and certification rules.
Clark-Wilson is more clearly applicable to business and industry processes in which the integrity
of the information content is paramount at any level of classification.
Integrity goals of Clark-Wilson model:
Prevent unauthorized users from making modification (Only this one is addressed by the Biba
model).
Separation of duties prevents authorized users from making improper modifications.
Well formed transactions: maintain internal and external consistency i.e. it is a series of operations
that are carried out to transfer the data from one consistent state to the other.
The following are incorrect answers:
The Biba model is incorrect. The Biba model is concerned with integrity and controls access to
objects based on a comparison of the security level of the subject to that of the object.
The Bell-LaPdaula model is incorrect. The Bell-LaPaula model is concerned with confidentiality
and controls access to objects based on a comparison of the clearence level of the subject to the
classification level of the object.
The information flow model is incorrect. The information flow model uses a lattice where objects
are labelled with security classes and information can flow either upward or at the same level. It is
similar in framework to the Bell-LaPadula model.
References:
ISC2 Official Study Guide, Pages 325 - 327
AIO3, pp. 284 - 287
AIOv4 Security Architecture and Design (pages 338 - 342)
AIOv5 Security Architecture and Design (pages 341 - 344)
Wikipedia at: https://en.wikipedia.org/wiki/Clark-Wilson_model
NEW QUESTION 50
Which of the following provides the MOST protection against data theft of sensitive information when a laptop is stolen?
- A. Encrypt the virtual drive where confidential files can be stored
- B. Implement a mandatory policy in which sensitive data cannot be stored on laptops, but only on the corporate network
- C. Set up a BIOS and operating system password
- D. Encrypt the entire disk and delete contents after a set number of failed access attempts
Answer: D
NEW QUESTION 51
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