What is the primary purpose of the chain of custody in digital forensics?

• A. Document seizure, handling, transfer, and storage of evidence to preserve its integrity and admissibility
• B. Determine the suspect's involvement
• C. Encrypt evidence to protect privacy
• D. Analyze the data for trends

Answer: (A)

Maintaining the chain of custody is about documenting seizure, handling, transfer, and storage of digital evidence to preserve its integrity and admissibility. By keeping a clear, auditable record of every time the evidence changes hands or location—who touched it, when, where it was stored, and how it was preserved—you can prove that the data has not been altered since collection. Integrity checks, like hash values for original and copied data, use of write-blockers, and security-controlled storage, all support this verification. If the chain of custody is broken or poorly documented, the evidence risks being considered unreliable or inadmissible in court, regardless of what the data shows. This purpose is distinct from determining involvement, encrypting data for privacy, or analyzing data for trends.