What is a concern for gathering forensics evidence in public cloud environments?

Multitenancy is a core architectural principle of public cloud computing where multiple customers (tenants) share the same physical infrastructure. This creates a significant forensic challenge because any evidence gathering process, such as creating a disk image or memory snapshot, must be meticulously isolated to the specific tenant under investigation. The Cloud Service Provider (CSP) has a legal and contractual obligation to protect the confidentiality and integrity of all other tenants' data on the shared hardware. This requirement complicates evidence acquisition, often limiting the types of data that can be collected and requiring specialized tools and procedures controlled by the CSP to prevent data spillage.

A. High Cost: While costs are associated with cloud services (e.g., for storing snapshots), there is not typically a specific high "forensics fee." This is a general business consideration, not a fundamental technical challenge of evidence gathering.
B. Configuration: Proper network segmentation and security zones are proactive security controls implemented before an incident. They are part of a good security posture, not a problem encountered during forensic evidence gathering.
C. Timeliness: While delays in evidence gathering can be an issue, this is often a consequence of other core challenges, primarily the complexities introduced by multitenancy and the need for the provider to coordinate a legally and technically sound acquisition.

1. Ghahremani

F.

Ghaemi

R.

& Teshnehlab

M. (2016). Cloud Forensics: Technical and Legal Challenges. In 2016 4th International Conference on Control

Instrumentation

and Automation (ICCIA). IEEE. (DOI: https://doi.org/10.1109/ICCIAutom.2016.7483178). This paper explicitly identifies "Multi-Tenancy" as a primary technical challenge

stating

"In a multi-tenant environment

a digital forensic investigation on one tenant should not affect other co-located tenants." (Section III. A. Technical Challenges).

2. National Institute of Standards and Technology (NIST). (2011). NIST Special Publication 800-145: The NIST Definition of Cloud Computing. (DOI: https://doi.org/10.6028/NIST.SP.800-145). This document defines "Resource Pooling" as an essential characteristic where the provider's resources are pooled to serve multiple consumers using a multi-tenant model. This foundational concept is the source of the forensic challenge described in option D.

3. Martini

B.

& Choo

K. K. R. (2012). An integrated conceptual digital forensic framework for cloud computing. Digital Investigation

9(2)

71-80. (DOI: https://doi.org/10.1016/j.diin.2012.07.001). The paper discusses how multitenancy complicates forensic investigations

noting that "an investigation of one client may violate the privacy of other clients sharing the same physical resources." (Section 3.1. Technical challenges).