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Certified Information Systems Auditor Questions 496–500 (page: 101)

Updated On: 10-Feb-2026

Which of the following will MOST likely compromise the control provided by a digital signature created using RSA encryption?

  1. Altering the plaintext message
  2. Deciphering the receiver's public key
  3. Obtaining the sender's private key
  4. Reversing the hash function using the digest

Answer(s): C



Which of the following should be of GREATEST concern to an IS auditor conducting an audit of an organization that recently experienced a ransomware attack?

  1. Antivirus software was unable to prevent the attack even though it was properly updated.
  2. Backups were only performed within the local network.
  3. The most recent security patches were not tested prior to implementation.
  4. Employees were not trained on cybersecurity policies and procedures.

Answer(s): B



Which of the following would an IS auditor recommend as the MOST effective preventive control to reduce the risk of data leakage?

  1. Validate that all data files contain digital watermarks.
  2. Implement an intrusion detection system (IDS).
  3. Ensure that paper documents are disposed securely.
  4. Verify that application logs capture any changes made.

Answer(s): C



Which of the following should an IS auditor review FIRST when planning a customer data privacy audit?

  1. Legal and compliance requirements
  2. Customer agreements
  3. Data classification
  4. Organizational policies and procedures

Answer(s): A



Which of the following attack techniques will succeed because of an inherent security weakness in an Internet firewall?

  1. Flooding the site with an excessive number of packets
  2. Intercepting packets and viewing passwords
  3. Phishing
  4. Using a dictionary attack of encrypted passwords

Answer(s): A



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