Gianna, a forensic investigator, is tasked with ensuring the integrity of the forensic image file she created from a suspect's hard drive. To verify that the image file matches the original drive…

Question

Options

• Adcfldd if=/dev/sda vf=image.dd
• Bdcfldd if=/dev/sda split=2M of=usbimg hash=md5 hashlog=usbhash.log
• Cdcfldd if=/dev/sda of=usbimg.dat
• Ddd if=/dev/sdb | split -b 650m -image_sdb

• A
  73% (22)
• B
  17% (5)
• C
  7% (2)
• D
  3% (1)

Explanation

This question aligns with CHFI v11 objectives under Data Acquisition and Duplication, specifically image validation and forensic integrity verification. After acquiring a forensic image, it is a mandatory best practice to verify that the image is an exact bit-for-bit replica of the original evidence source. CHFI v11 stresses that verification protects evidence integrity and supports legal admissibility by proving that no data was altered during acquisition. The dcfldd tool--an enhanced version of the Unix dd utility--supports forensic features such as hashing, logging, splitting, and image verification. The vf (verify file) parameter in the command dcfldd if=/dev/sda vf=image.dd directly compares the original input device (/dev/sda) with the previously created image file (image.dd). This ensures that both sources match exactly, sector by sector.

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