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NEW QUESTION: 1
Secure Sockets Layer (SSL) uses a Message Authentication Code (MAC) for what purpose?
A. message integrity.
B. message confidentiality.
C. message interleave checking.
D. message non-repudiation.
Answer: A
Explanation:
Explanation/Reference:
A keyed hash also called a MAC (message authentication code) is used for integrity protection and authenticity.
In cryptography, a message authentication code (MAC) is a generated value used to authenticate a message. A MAC can be generated by HMAC or CBC-MAC methods. The MAC protects both a message's integrity (by ensuring that a different MAC will be produced if the message has changed) as well as its authenticity, because only someone who knows the secret key could have modified the message.
MACs differ from digital signatures as MAC values are both generated and verified using the same secret key. This implies that the sender and receiver of a message must agree on the same key before initiating communications, as is the case with symmetric encryption. For the same reason, MACs do not provide the property of non-repudiation offered by signatures specifically in the case of a network-wide shared secret key: any user who can verify a MAC is also capable of generating MACs for other messages.
HMAC
When using HMAC the symmetric key of the sender would be concatenated (added at the end) with the message. The result of this process (message + secret key) would be put through a hashing algorithm, and the result would be a MAC value. This MAC value is then appended to the message being sent. If an enemy were to intercept this message and modify it, he would not have the necessary symmetric key to create a valid MAC value. The receiver would detect the tampering because the MAC value would not be valid on the receiving side.
CBC-MAC
If a CBC-MAC is being used, the message is encrypted with a symmetric block cipher in CBC mode, and the output of the final block of ciphertext is used as the MAC. The sender does not send the encrypted version of the message, but instead sends the plaintext version and the MAC attached to the message.
The receiver receives the plaintext message and encrypts it with the same symmetric block cipher in CBC mode and calculates an independent MAC value. The receiver compares the new MAC value with the MAC value sent with the message. This method does not use a hashing algorithm as does HMAC.
Cipher-Based Message Authentication Code (CMAC)
Some security issues with CBC-MAC were found and they created Cipher-Based Message Authentication Code (CMAC) as a replacement. CMAC provides the same type of data origin authentication and integrity as CBC-MAC, but is more secure mathematically. CMAC is a variation of CBC-MAC. It is approved to work with AES and Triple DES. HMAC, CBC-MAC, and CMAC work higher in the network stack and can identify not only transmission errors (accidental), but also more nefarious modifications, as in an attacker messing with a message for her own benefit. This means all of these technologies can identify intentional, unauthorized modifications and accidental changes- three in one.
The following are all incorrect answers:
"Message non-repudiation" is incorrect.
Nonrepudiation is the assurance that someone cannot deny something. Typically, nonrepudiation refers to the ability to ensure that a party to a contract or a communication cannot deny the authenticity of their signature on a document or the sending of a message that they originated.
To repudiate means to deny. For many years, authorities have sought to make repudiation impossible in some situations. You might send registered mail, for example, so the recipient cannot deny that a letter was delivered. Similarly, a legal document typically requires witnesses to signing so that the person who signs cannot deny having done so.
On the Internet, a digital signature is used not only to ensure that a message or document has been electronically signed by the person that purported to sign the document, but also, since a digital signature can only be created by one person, to ensure that a person cannot later deny that they furnished the signature.
"Message confidentiality" is incorrect. The Message confidentiality is protected by encryption not by hashing algorithms.
"Message interleave checking" is incorrect. This is a nonsense term included as a distractor.
Reference(s) used for this question:
Harris, Shon (2012-10-25). CISSP All-in-One Exam Guide, 6th Edition (p. 1384). McGraw-Hill. Kindle Edition.
and
http://csrc.nist.gov/publications/nistpubs/800-38B/SP_800-38B.pdf
and
http://searchsecurity.techtarget.com/definition/nonrepudiation
and
https://en.wikipedia.org/wiki/Message_authentication_code
NEW QUESTION: 2
Your network contains an Active Directory domain named contoso.com. The domain contains 200 computers that run Windows 10.
Folder Redirection for the Desktop folder is configured as shown in the following exhibit.
The target is set to Server1.
You plan to use known folder redirection in Microsoft OneDrive for Business.
You need to ensure that the desktop content of users remains on their desktop when you implement known folder redirection.
Which two actions should you perform? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.
A. Clear the Grant the user exclusive rights to Desktop check box.
B. Disable Folder Redirection.
C. Clear the Move the contents of Desktop to the new location check box.
D. Change the Policy Removal setting.
Answer: B,D
Explanation:
Explanation
The OneDrive Known Folder Move Group Policy objects won't work if you previously used Windows Folder Redirection Group Policy objects to redirect the Documents, Pictures, or Desktop folders to a location other than OneDrive. Remove the Windows Group Policy objects for these folders before you enable the OneDrive Group Policy objects. The OneDrive Group Policy objects won't affect the Music and Videos folders, so you can keep them redirected with the Windows Group Policy objects. For info about Windows Folder Redirection, see Deploy Folder Redirection with Offline Files."
NEW QUESTION: 3
식당 예약 애플리케이션에는 대기자 명단을 유지하는 기능이 필요합니다. 고객이 테이블을 예약하려고 하는데 사용 가능한 테이블이 없으면 고객을 대기자 명단에 올려야 하며 테이블이 비어있을 때 응용 프로그램이 고객에게 알려야합니다.
시스템이 고객 요청이 대기자 명단에 올라간 순서를 존중하도록 Solutions Architect는 어떤 서비스를 권장해야 합니까?
A. Amazon SQS의 FIFO 대기열
B. Amazon SQS의 표준 대기열
C. 순차적 디스패치 기능이있는 AWS Lambda
D. Amazon SNS
Answer: A
NEW QUESTION: 4
Which of the following is NOT a characteristic of a host-based intrusion detection system?
A. A HIDS does not consume large amounts of system resources
B. A HIDS can analyse system logs, processes and resources
C. A HIDS looks for unauthorized changes to the system
D. A HIDS can notify system administrators when unusual events are identified
Answer: A
Explanation:
A HIDS does not consume large amounts of system resources is the correct choice. HIDS can consume inordinate amounts of CPU and system resources in order to function effectively, especially during an event. All the other answers are characteristics of HIDSes
A HIDS can:
-scrutinize event logs, critical system files, and other auditable system resources;
-look for unauthorized change or suspicious patterns of behavior or activity
-can send alerts when unusual events are discovered
Reference:
Official guide to the CISSP CBK. Pages 197 to 198.