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Difficulty: MediumDigital Forensics and Chain of Custody

A cybersecurity forensic analyst has just completed a bit-stream disk acquisition of a target drive seized during an insider threat investigation. The analyst must now process and secure the physical drive and digital image to ensure legal admissibility in court. Place the following evidence handling and chain of custody steps in the correct chronological order from first to last.

  1. 1Generate and document a baseline cryptographic hash (e.g., SHA-256) of the acquired forensic image.
  2. 2Complete the initial chain of custody log entry with item details, timestamps, collector identity, and baseline hash value.
  3. 3Place the original drive into an antistatic tamper-evident bag and apply a signed tamper-proof seal.
  4. 4Deposit the sealed evidence package into a secure evidence vault and log the storage location transfer.

Answer

The correct chronological order for preserving forensic disk evidence is: (1) Generate and document a baseline cryptographic hash of the acquired forensic image, (2) Complete the initial chain of custody log entry with item details, timestamps, collector identity, and baseline hash value, (3) Place the original drive into an antistatic tamper-evident bag and apply a signed tamper-proof seal, and (4) Deposit the sealed evidence package into a secure evidence vault and log the storage location transfer.
Digital forensic integrity relies on immediate verification followed by meticulous documentation and physical security. First, generating a baseline cryptographic hash immediately after bit-stream acquisition verifies that the copy is exact and unaltered. Second, recording this hash alongside collector details, serial numbers, and timestamps on the chain of custody form creates an official legal record. Third, physically enclosing the drive in a sealed tamper-evident bag ensures protection against tampering and static. Finally, transferring the sealed item to a secure evidence locker and logging the location transfer maintains an unbroken chain of custody.

Step-by-Step Solution

1
Verify baseline data integrity
Generating a SHA-256 hash immediately after image capture creates a mathematical signature of the evidence state.
Cryptographic hashes prove non-repudiation and verify that the evidence has not been tampered with or corrupted during acquisition.
2
Record chain of custody documentation
The collector logs essential metadata including collector name, date, time, serial number, and baseline hash.
Detailed documentation establishes accountability and legal defensibility before the evidence is packaged.
3
Package and seal physical evidence
The physical media is secured inside a anti-static tamper-evident bag with a signed security seal across the opening.
Physical sealing ensures protection against electrostatic discharge and detects any physical compromise.
4
Secure evidence and log custodial transfer
The sealed bag is transferred to an access-controlled evidence vault, and the transfer of custody log is updated.
Maintaining continuous custody tracking prevents claims of evidence contamination or unrecorded access.

Key Concept

Chain of Custody and Evidence Integrity Preservation Workflow
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Topics

Digital Forensics and Chain of Custody

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