When remote access to confidential information is granted to a vendor for analytic purposes, which of the following is the MOST important security…

The most important security consideration is ensuring the vendor contractually agrees to the organization's information security policy. This agreement is a foundational governance control that legally and formally binds the vendor to the organization's security standards and requirements. It establishes the "rules of the road" for data handling, making all other specific controls—such as encryption, access control, and logging—enforceable. Without this overarching policy agreement, there is no formal basis to hold the vendor accountable for implementing or adhering to any specific security measures, creating significant risk.

A. Data is encrypted in transit and at rest at the vendor site.

While encryption is a critical technical control, it is a specific requirement that would be mandated by the overarching information security policy.

B. Data is subject to regular access log review.

This is an important detective control, but like encryption, it is a specific procedure that is defined and enforced through the policy agreement.

C. The vendor must be able to amend data.

This is a functional requirement, not a security consideration. For analytic purposes, the principle of least privilege would typically dictate read-only access.

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1. ISACA

CISM Review Manual

15th Edition. In Domain 3: Information Security Program Development and Management

the section on "Third-Party Relationships" emphasizes that security requirements must be included in contracts and agreements with third parties. It states

"The information security manager must ensure that contracts with third parties...include requirements to comply with the organization's security policies." (p. 148). This establishes the policy agreement as the primary mechanism for enforcing all other controls.

2. ISACA

CISM Review Manual

15th Edition. Domain 1: Information Security Governance

highlights that a key outcome of governance is to "ensure that information security policies...are established

communicated

and complied with by all relevant parties

including third parties." (p. 52). This underscores the primacy of policy communication and agreement as a core governance function.

3. Foti

M. (2015). Managing Third Party Risk: A Practical Guide to Vendor and Third Party Risk Management. This academic text on vendor risk management explains that the contractual agreement

which incorporates the organization's security policies

is the cornerstone of the relationship. "The contract is the single most important risk management tool in the third-party relationship... It should explicitly reference the requirement to adhere to the hiring firm's information security policies." (Chapter 4: The Contract).