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Determining accountability of data owners is the most important activity in the data classification process. Data classification is a process that assigns categories or labels to data based on their value, sensitivity, criticality and risk to the organization. Data classification helps to determine the appropriate level of protection, access and retention for data. Determining accountability of data owners is an activity that identifies and assigns roles and responsibilities for data classification, protection and management to individuals or functions within the organization. Data owners are individuals or functions who have authority and responsibility for defining, classifying, protecting and managing data throughout their lifecycle. Determining accountability of data owners is essential for ensuring that data are classified correctly and consistently, and that data classification policies and procedures are followed and enforced. The other options are not as important as option C, as they are dependent on or derived from the accountability of data owners. Labeling the data appropriately is an activity that applies the categories or labels assigned by data owners to data based on their classification criteria. Identifying risk associated with the data is an activity that assesses the potential impact and likelihood of loss, disclosure, modification or destruction of data based on their classification level. Determining the adequacy of privacy controls is an activity that evaluates whether the controls implemented to protect personal or sensitive data are sufficient and effective based on their classification level. References: CISA Review Manual (Digital Version) , Chapter 5: Protection of Information Assets, Section 5.3: Data Classification.

 The auditor’s best course of action when senior management disagrees with some of the facts presented in the draft audit report is to gather evidence to analyze senior management’s objections. The auditor should not revise the assessment, escalate the issue, or finalize the report without changes until they have evaluated the validity and relevance of senior management’s objections and resolved any discrepancies or misunderstandings. The auditor should maintain a professional and objective attitude and seek to present a fair and accurate audit report based on sufficient and appropriate evidence. References:

CISA Review Manual (Digital Version), page 372

CISA Questions,Answers & Explanations Database, question ID 3338

The condition that would be of most concern to an IS auditor assessing the risk of a successful brute force attack against encrypted data at rest is short key length. A brute force attack is a method of breaking encryption by trying all possible combinations of keys until finding the correct one. The shorter the key length, the easier it is for an attacker to guess or crack the encryption. Random key generation, use of symmetric encryption, and use of asymmetric encryption are not conditions that would increase the risk of a successful brute force attack. In fact, random key generation can enhance security by preventing predictable patterns in key selection. Symmetric encryption and asymmetric encryption are different types of encryption that have their own advantages and disadvantages, but neither is inherently more vulnerable to brute force attacks than the other. References: CISA Review Manual (Digital Version): Chapter 5 - Information Systems Operations and Business Resilience

The greatest concern for an IS auditor when reviewing IT policies and procedures that are not regularly reviewed and updated is that policies and procedures might not reflect current practices. Policies are documents that define the goals, objectives, and guidelines for an organization’s information systems and resources. Procedures are documents that describe the steps, tasks, or activities for implementing or executing policies. Policies and procedures should be regularly reviewed and updated to ensure that they are relevant, accurate, consistent, and effective for the organization’s information systems and resources. Policies and procedures that are not regularly reviewed and updated might not reflect current practices, as they might be outdated, obsolete, or incompatible with the current state or needs of the organization’s information systems and resources. This can cause confusion, inconsistency, inefficiency, or noncompliance among users or stakeholders who rely on policies and procedures for guidance or direction. Policies and procedures might not include new systems and corresponding process changes is a possible concern for an IS auditor when reviewing IT policies and procedures that are not regularly reviewed and updated, but it is not the greatest one. Policies and procedures might not include new systems and corresponding process changes, as they might be unaware of or unresponsive to the introduction or modification of information systems or resources within the organization. This can cause gaps, overlaps, or conflicts among policies and procedures that affect different information systems or resources.