Which hash algorithm does EnCase calculate to verify the integrity of acquired drives?

Which hash algorithm does EnCase calculate to verify the integrity of acquired drives?

• A. SHA-1
• B. MD5
• C. SHA-256
• D. CRC32

Answer: (B)

Hash-based integrity verification for acquired drives rests on creating a fixed-size digest from the exact bytes of the image and comparing it later to detect any changes. EnCase has historically used MD5 for this digest, generating a 128-bit hash when the image is acquired and storing it with the evidence. Recomputing the hash of the acquired image and comparing it to the stored MD5 value confirms that the data has not altered since acquisition. MD5 is fast to compute on large disk images and provides a stable, compact fingerprint suitable for routine verification. While other hashes like CRC32 are not suited for ensuring data integrity in forensic contexts due to their weaker collision resistance, and stronger hashes like SHA-1 or SHA-256 offer more cryptographic security, the typical EnCase verification workflow cited uses MD5 for its balance of speed and reliability in this specific task.

Hash-based integrity verification for acquired drives rests on creating a fixed-size digest from the exact bytes of the image and comparing it later to detect any changes. EnCase has historically used MD5 for this digest, generating a 128-bit hash when the image is acquired and storing it with the evidence. Recomputing the hash of the acquired image and comparing it to the stored MD5 value confirms that the data has not altered since acquisition. MD5 is fast to compute on large disk images and provides a stable, compact fingerprint suitable for routine verification. While other hashes like CRC32 are not suited for ensuring data integrity in forensic contexts due to their weaker collision resistance, and stronger hashes like SHA-1 or SHA-256 offer more cryptographic security, the typical EnCase verification workflow cited uses MD5 for its balance of speed and reliability in this specific task.