What is the purpose of calculating and verifying a hash value during digital evidence handling?

What is the purpose of calculating and verifying a hash value during digital evidence handling?

• A. To verify the integrity of the forensic image and detect any tampering.
• B. To compress the data for storage.
• C. To encrypt the data for secure transport.
• D. To annotate the file with metadata automatically.

Answer: (A)

Hashing creates a unique fingerprint of digital evidence. When you acquire a forensic image, you generate a hash value and preserve it with the evidence. Later, you recompute the hash on the copy and compare it to the original. If the values match, you have strong assurance that the copy is identical to the original and has not been altered; if they differ, something changed the data, signaling tampering or corruption and calling into question the integrity and admissibility of the evidence. This process is all about proving that the evidence remains unmodified throughout handling and transfer. It’s not about compressing data, encrypting it for transport, or automatically adding metadata.

Hashing creates a unique fingerprint of digital evidence. When you acquire a forensic image, you generate a hash value and preserve it with the evidence. Later, you recompute the hash on the copy and compare it to the original. If the values match, you have strong assurance that the copy is identical to the original and has not been altered; if they differ, something changed the data, signaling tampering or corruption and calling into question the integrity and admissibility of the evidence. This process is all about proving that the evidence remains unmodified throughout handling and transfer. It’s not about compressing data, encrypting it for transport, or automatically adding metadata.