What is a primary method to verify the integrity of a forensic image during acquisition?

What is a primary method to verify the integrity of a forensic image during acquisition?

• A. Hash the image and compare to the original hash
• B. Trust the file size
• C. Check only the created date
• D. Copy again without hashing

Answer: (A)

Hashing the image and comparing it to a trusted original hash is the primary way to verify a forensic image’s integrity. A cryptographic hash acts as a unique fingerprint of every bit in the data, so when the image is created you generate and securely store a hash, then re-calculate the hash on the acquired image and compare. If the hashes match, you can be confident the copy is bit-for-bit identical to the source and has not been altered in transit or storage. This approach is far more reliable than relying on file size, which can be unchanged even if data changes, or on metadata like the created date, which can be manipulated. Copying again without hashing may reproduce the data, but without re-verifying with a hash you have no proof the copy is unaltered. In practice, use a strong hash algorithm (for example, SHA-256) and compare the resulting value to the one recorded at acquisition to ensure integrity.

Hashing the image and comparing it to a trusted original hash is the primary way to verify a forensic image’s integrity. A cryptographic hash acts as a unique fingerprint of every bit in the data, so when the image is created you generate and securely store a hash, then re-calculate the hash on the acquired image and compare. If the hashes match, you can be confident the copy is bit-for-bit identical to the source and has not been altered in transit or storage. This approach is far more reliable than relying on file size, which can be unchanged even if data changes, or on metadata like the created date, which can be manipulated. Copying again without hashing may reproduce the data, but without re-verifying with a hash you have no proof the copy is unaltered. In practice, use a strong hash algorithm (for example, SHA-256) and compare the resulting value to the one recorded at acquisition to ensure integrity.