Examkin

Question

Difficulty: MediumDigital Forensics and Chain of Custody

During a legal discovery phase following a enterprise data breach investigation, opposing counsel challenges the admissibility of a forensic disk image, alleging that unauthorized modifications could have occurred while the evidence was stored in the forensic laboratory safe. Which of the following evidence handling practices provides the primary technical proof to refute this integrity challenge?

  1. Comparing the cryptographic hash value calculated during evidence intake against a newly calculated hash of the stored imageAnswer
  2. B
    Producing a digital signature from the chief security officer to establish non-repudiation of the initial drive seizure
  3. C
    Demonstrating that volatile system RAM was captured prior to creating the persistent disk image
  4. D
    Attaching a hardware write-blocker to the forensic workstation while presenting the evidence in court

Answer

Comparing the cryptographic hash value calculated during evidence intake against a newly calculated hash of the stored image provides the definitive proof of data integrity required to defeat court challenges.
Cryptographic hashing (such as SHA-256) is used in digital forensics to verify data integrity. Computing a hash value immediately after evidence acquisition and comparing it against a hash calculated at any later point (such as during trial or discovery) proves that the bit-stream forensic image has not been altered or tampered with during storage.

Step-by-Step Solution

1
Identify the specific forensic requirement challenged in the scenario
Opposing counsel is questioning evidence integrity (whether data was altered during storage).
Establishing chain of custody and evidence admissibility requires proving data integrity from acquisition through trial.
2
Evaluate technical controls for verifying bit-stream evidence integrity
Cryptographic hashing algorithms (like SHA-256 or MD5) generate a unique fixed-length digest of the entire image.
If even a single bit of the forensic image changes during storage, recalculating the hash will produce a completely different value.
3
Select the option that directly validates that no alteration occurred
Re-hashing the stored image and comparing it to the original hash recorded upon intake proves data integrity.
Matching hashes demonstrate beyond reasonable doubt that the evidence remained identical throughout the storage period.

Key Concept

Forensic Hash Verification and Integrity Enforcement
Rate this question

Topics

Digital Forensics and Chain of Custody

More questions from this topic