What principle guides the sequence of evidence collection in a digital forensics investigation?

• A. The order of volatility principle
• B. The chain of custody principle
• C. The principle of least privilege
• D. The defense in depth principle

Answer: (A)

The sequence of evidence collection is guided by the order of volatility: data that can disappear or change rapidly must be captured first. In a live digital forensics scenario, memory contents, running processes, network connections, and other volatile system state are at immediate risk of being lost if the machine is powered off or rebooted. By imaging or capturing RAM and live artifacts first, you preserve information such as active encryption keys, credentials, transient data, and signs of malware that reside only in memory.

Only after securing this volatile data do you move on to non-volatile evidence like disk images, logs on persistent storage, and other artifacts that persist after shutdown. This approach minimizes the chance of losing critical evidence and maintains the integrity of the investigation.

The other concepts are important in their own right but do not determine the order of collection. Chain of custody focuses on documenting who handles evidence and how it’s transferred. Least privilege aims to limit access rights. Defense in depth is a security strategy that layers protections.