Interested to Buy Any Domain ? << Click Here >> for more details...
A single digitally signed instruction was given to a
financial institution to credit a customer's account. The
financial institution received the instruction three times
and credited the account three times. Which of the following
would be the MOST appropriate control against such multiple
credits?
A. Encrypting the hash of the payment instruction with the
public key of the financial institution.
B. Affixing a time stamp to the instruction and using it to
check for duplicate payments.
C. Encrypting the hash of the payment instruction with the
private key of the instructor.
D. Affixing a time stamp to the hash of the instruction
before being digitally signed by the instructor.
- 1 Answers
- 6996 Views
- I also Faced
- E-Mail Answers
Answer / guest
Answer: B
Affixing a time stamp to the instruction and using it to
check for duplicate payments makes the instruction unique.
The financial institution can check that the instruction was
not intercepted and replayed and thus it could prevent
crediting the account three times. Encrypting the hash of
the payment instruction with the public key of the financial
institution does not protect replay, it only protects
confidentiality and integrity of the instruction. Encrypting
the hash of the payment instruction with the private key of
the instructor ensures integrity of the instruction and
nonrepudiation of the issued instruction. The process of
creating a message digest requires applying a cryptographic
hashing algorithm to the entire message. The receiver, upon
decrypting the message digest, will re-compute the hash
using the same hashing algorithm and compare the result with
what was sent. Hence, affixing a time stamp into the hash of
the instruction before being digitally signed by the
instructor would violate the integrity requirements of
digital signature.
| Is This Answer Correct ? | 2 Yes | 0 No |
An IS auditor auditing hardware monitoring procedures should review A. system availability reports. B. cost-benefit reports. C. response time reports. D. database utilization reports.
During a post-implementation review of an enterprise resource management system, an IS auditor would MOST likely: A. review access control configuration. B. evaluate interface testing. C. review detailed design documentation. D. evaluate system testing.
A company has implemented a new client-server enterprise resource planning (ERP) system. Local branches transmit customer orders to a central manufacturing facility. Which of the following would BEST ensure that the orders are entered accurately and the corresponding products are produced? A. Verifying production to customer orders B. Logging all customer orders in the ERP system C. Using hash totals in the order transmitting process D. Approving (production supervisor) orders prior to production
Which of the following is the MOST important issue to the IS auditor in a business process re-engineering (BPR) project would be? A. The loss of middle management, which often is a result of a BPR project B. That controls are usually given low priority in a BPR project C. The considerable negative impact that information protection could have on BPR D. The risk of failure due to the large size of the task usually undertaken in a BPR project
An IS auditor observed that some data entry operators leave their computers in the midst of data entry without logging off. Which of the following controls should be suggested to prevent unauthorized access? A. Encryption B. Switch off the computer when leaving C. Password control D. Screen saver password
To affix a digital signature to a message, the sender must first create a message digest by applying a cryptographic hashing algorithm against: A. the entire message and thereafter enciphering the message digest using the sender's private key. B. any arbitrary part of the message and thereafter enciphering the message digest using the sender's private key. C. the entire message and thereafter enciphering the message using the sender's private key. D. the entire message and thereafter enciphering the message along with the message digest using the sender's private key.
In a public key infrastructure (PKI), the authority responsible for the identification and authentication of an applicant for a digital certificate (i.e., certificate subjects) is the: A. registration authority (RA). B. issuing certification authority (CA). C. subject CA. D. policy management authority.
Which of the following is MOST likely to occur when a system development project is in the middle of the programming/coding phase? A. Unit tests B. Stress tests C. Regression tests D. Acceptance tests
Which of the following controls would BEST detect intrusion? A. User ids and user privileges are granted through authorized procedures. B. Automatic logoff is used when a workstation is inactive for a particular period of time. C. Automatic logoff of the system after a specified number of unsuccessful attempts. D. Unsuccessful logon attempts are monitored by the security administrator.
Which of the following would be the BEST method for ensuring that critical fields in a master record have been updated properly? A. Field checks B. Control totals C. Reasonableness checks D. A before-and-after maintenance report
A primary benefit derived from an organization employing control self-assessment (CSA) techniques is that it:
An organization is experiencing a growing backlog of undeveloped applications. As part of a plan to eliminate this backlog, end-user computing with prototyping, supported by the acquisition of an interactive application generator system is being introduced. Which of the following areas is MOST critical to the ultimate success of this venture? A. Data control B. Systems analysis C. Systems programming D. Application programming
Cisco Certifications 
