What invalidates digital evidence authenticity?

Digital Forensics
Answer Correct answer: A — Installing forensic software on the original drive modifies data and invalidates authenticity.

Which of the following will invalidate the authenticity of digital evidence in a forensic investigation?

  1. The investigator installed forensic software on the original drive that contained the evidence. Correct Answer
  2. The evidence was collected from analysis of a copy of the disk data.
  3. A software write blocker was used in the collection of the evidence.
  4. The investigator collected the evidence while the machine was still powered on.
digital evidence authenticity forensic investigation best practices write blocker usage cisa evidence handling

Community Insight

This tests the principle of preserving original evidence integrity, where the trap is confusing live acquisition with direct modification of the source media.

Modifying the original evidence drive by installing software destroys data integrity. The community agrees that working on a copy is essential to maintain authenticity.

Choosing Option D is common because live acquisition is risky, but installing software on the original drive (Option A) is a direct violation of integrity.

Community Discussion (3 comments)

1e71ed5 👍 3
Option A, where the investigator installed forensic software on the original drive that contained the evidence, could also impact the authenticity of the evidence. Installing software on the original drive might modify or alter the data, thus compromising its integrity. Forensic best practices recommend making a bit-for-bit copy of the drive and performing analysis on the copy to avoid altering the original evidence. In summary, both options A and D can affect the authenticity of digital evidence, but D is generally considered more critical because it directly involves potential changes to the original data while it is being collected.
marc4354345 👍 4
A is correct.
Sibsankar 👍 1
The right answer will be D due to the inherent risk of modifications and potential compromises to the chain of custody, collecting evidence from a copy of the disk data presents the greatest concern regarding its authenticity in a forensic investigation. It's important to note that the validity of digital evidence ultimately depends on a holistic assessment of all collection, handling, and analysis procedures. Consulting with experts and following established forensic methodologies are crucial for ensuring the admissibility and reliability of digital evidence.

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Expert Analysis

Why the Answer Is Correct

Installing forensic software on the original drive writes data to the media. This changes file access times, modifies the file system, and potentially overwrites unallocated space. These changes alter the state of the evidence, making it impossible to prove the data is in its original state. Therefore, authenticity is invalidated.

Why the Other Options Are Wrong

Option B is incorrect because analyzing a copy is the standard best practice to preserve the original. Option C is incorrect because write blockers are tools specifically designed to prevent modification and ensure authenticity. Option D is incorrect because live acquisition is a valid procedure for capturing volatile data like RAM, provided it is documented, and does not inherently invalidate authenticity like altering the drive does.

Community Comment Notes

Comment [1] correctly identifies that installing software modifies data and compromises integrity, recommending bit-for-bit copies. Comment [3] confirms this view. Comment [2] suggests Option D but contains confusing logic regarding copies; however, the majority view and standard forensic principles strongly support Option A.

Official Reference

https://www.nist.gov/publications/guide-integrating-forensic-techniques-incident-response

Exam Strategy

Always look for actions that modify the original evidence. If an option involves writing to the source drive, it is almost certainly the answer for invalidating evidence.

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