Question 140
A legacy case system stores only MD5 checksums, but a new acquisition requires stronger assurance. Which practice balances comparability and security?
- MD5 legacy compatibility
- SHA-256 evidence digest
- Source-image verification
- Hash-based file identification
Explanation
Correct Answer
A:Record the legacy digest where necessary and calculate a modern algorithm such as SHA-256 as well. MD5 has known collision weaknesses, especially for adversarial authenticity claims.
Incorrect Answers
B:Even though the scenario needs integrity records compatible with a legacy workflow, SHA-256 creates a fixed-length digest that changes with nearly any content modification and is widely used for integrity checks; the action relates to checking the integrity of acquired bytes. A matching digest supports byte-level consistency but not lawful acquisition; this remains insufficient for integrity records compatible with a legacy workflow.
C:For the separate question of confirming image content matches acquired source bytes, compute appropriate digests over comparable source and image byte ranges and compare results, accounting for any documented read errors; the requested assessment of integrity records compatible with a legacy workflow remains open. Different scope or unreadable sectors can invalidate a naive equality test; there is no direct finding about integrity records compatible with a legacy workflow.
D:The objective here is integrity records compatible with a legacy workflow; comparing content digests identifies exact byte matches independently of file names or extensions; the option would instead inform identifying a known binary despite a renamed filename. A changed build or repackaged file will not match the original digest; it is not direct evidence of integrity records compatible with a legacy workflow.
Question 141
A collection consists of thousands of exported files that will be transported individually. Which artifact supports checking each file after transfer?
- SHA-256 evidence digest
- Source-image verification
- Hash manifest
- Read error handling
Explanation
Correct Answer
C:A manifest containing filenames, relevant paths and cryptographic digests permits per-file validation. An overall folder name cannot detect a changed individual member reliably.
Incorrect Answers
A:The stem asks about verification of every transferred file; SHA-256 creates a fixed-length digest that changes with nearly any content modification and is widely used for integrity checks; the described operation is used for checking the integrity of acquired bytes. A matching digest supports byte-level consistency but not lawful acquisition; a determination about verification of every transferred file requires other support.
B:Instead of a method addressing verification of every transferred file, compute appropriate digests over comparable source and image byte ranges and compare results, accounting for any documented read errors; this one concerns confirming image content matches acquired source bytes. Different scope or unreadable sectors can invalidate a naive equality test; it cannot independently determine verification of every transferred file.
D:A case involving provenance of missing sectors in a disk image might use this approach: read-error maps and substituted byte ranges must accompany the image, because those bytes do not represent recovered original data; the required result here is verification of every transferred file. Downstream interpretation must not present filler as authentic content; it cannot replace proof about verification of every transferred file.
Question 142
A laboratory claims its hardware write blocker prevents all host writes to evidence disks. Which validation approach is appropriate?
- Write-blocker test
- Source-image verification
- Hash collision caution
- Read error handling
Explanation
Correct Answer
A:Test the device with controlled media, attempted writes and before/after comparisons under the intended connection mode. A product label is not proof of current correct configuration.
Incorrect Answers
B:The current inquiry asks about whether a blocker actually prevents source modification; compute appropriate digests over comparable source and image byte ranges and compare results, accounting for any documented read errors; this mechanism chiefly addresses confirming image content matches acquired source bytes. Different scope or unreadable sectors can invalidate a naive equality test; it cannot prove whether a blocker actually prevents source modification on its own.
C:In an inquiry concerning the difference between byte similarity and authorship, a hash identifies content probabilistically and provides no author identity or provenance; the scope does not extend to whether a blocker actually prevents source modification. Even strong hashes cannot establish who created the data; collisions are theoretically possible; that issue cannot settle whether a blocker actually prevents source modification.
D:Even though the scenario needs whether a blocker actually prevents source modification, read-error maps and substituted byte ranges must accompany the image, because those bytes do not represent recovered original data; the action relates to provenance of missing sectors in a disk image. Downstream interpretation must not present filler as authentic content; this remains insufficient for whether a blocker actually prevents source modification.
Question 143
A damaged sector cannot be read consistently, yet the imaging system reports completion with fill bytes. What must be recorded?
- Read error handling
- MD5 legacy compatibility
- Timestamp authority
- Source-image verification
Explanation
Correct Answer
A:Read-error maps and substituted byte ranges must accompany the image, because those bytes do not represent recovered original data. Downstream interpretation must not present filler as authentic content.
Incorrect Answers
B:For questions about integrity records compatible with a legacy workflow, record the legacy digest where necessary and calculate a modern algorithm such as SHA-256 as well; that differs from provenance of missing sectors in a disk image. MD5 has known collision weaknesses, especially for adversarial authenticity claims; it provides no direct answer to provenance of missing sectors in a disk image.
C:The stem asks about provenance of missing sectors in a disk image; a trusted timestamp can bind a digest to a recorded time using a separate authority; the described operation is used for independent timing of a recorded cryptographic digest. It demonstrates that the digest existed by that time, not necessarily when the underlying file originated; a determination about provenance of missing sectors in a disk image requires other support.
D:Instead of a method addressing provenance of missing sectors in a disk image, compute appropriate digests over comparable source and image byte ranges and compare results, accounting for any documented read errors; this one concerns confirming image content matches acquired source bytes. Different scope or unreadable sectors can invalidate a naive equality test; it cannot independently determine provenance of missing sectors in a disk image.
Question 144
A lab wants to detect unauthorized modification of its exported acquisition report and identify the signing analyst. Which mechanism helps?
- Source-image verification
- Signed acquisition record
- MD5 legacy compatibility
- Hash manifest
Explanation
Correct Answer
B:A digital signature can bind report bytes to a controlled private key and permit integrity/authenticity checks. It does not prove every factual assertion in the report is correct.
Incorrect Answers
A:Although the case asks about whether an acquisition report has been altered since signing, compute appropriate digests over comparable source and image byte ranges and compare results, accounting for any documented read errors; the action instead concerns confirming image content matches acquired source bytes. Different scope or unreadable sectors can invalidate a naive equality test; it does not establish whether an acquisition report has been altered since signing.
C:When the investigative task is integrity records compatible with a legacy workflow, record the legacy digest where necessary and calculate a modern algorithm such as SHA-256 as well; that differs from the question about whether an acquisition report has been altered since signing. MD5 has known collision weaknesses, especially for adversarial authenticity claims; that leaves whether an acquisition report has been altered since signing unresolved.
D:The current inquiry asks about whether an acquisition report has been altered since signing; a manifest containing filenames, relevant paths and cryptographic digests permits per-file validation; this mechanism chiefly addresses verification of every transferred file. An overall folder name cannot detect a changed individual member reliably; it cannot prove whether an acquisition report has been altered since signing on its own.
Question 145
Two parties dispute when an evidence digest was deposited into a trusted repository. Which service can add independent time evidence?
- Timestamp authority
- SHA-256 evidence digest
- MD5 legacy compatibility
- Hash collision caution
Explanation
Correct Answer
A:A trusted timestamp can bind a digest to a recorded time using a separate authority. It demonstrates that the digest existed by that time, not necessarily when the underlying file originated.
Incorrect Answers
B:For a separate investigation of checking the integrity of acquired bytes, SHA-256 creates a fixed-length digest that changes with nearly any content modification and is widely used for integrity checks; that is not the determination of independent timing of a recorded cryptographic digest in the stem. A matching digest supports byte-level consistency but not lawful acquisition; the evidence still must speak to independent timing of a recorded cryptographic digest.
C:With independent timing of a recorded cryptographic digest as the investigative issue, record the legacy digest where necessary and calculate a modern algorithm such as SHA-256 as well; the result would concern integrity records compatible with a legacy workflow. MD5 has known collision weaknesses, especially for adversarial authenticity claims; this would not resolve independent timing of a recorded cryptographic digest.
D:For questions about the difference between byte similarity and authorship, a hash identifies content probabilistically and provides no author identity or provenance; that differs from independent timing of a recorded cryptographic digest. Even strong hashes cannot establish who created the data; collisions are theoretically possible; it provides no direct answer to independent timing of a recorded cryptographic digest.
Question 146
An examiner needs unallocated clusters, deleted-file remnants and partition structures from an HDD. Which collection type is most suitable?
- Dead-box acquisition
- Physical disk image
- Raw dd image
- Live memory acquisition
Explanation
Correct Answer
B:A physical acquisition covers addressable storage sectors beyond normal visible files, subject to access limitations. It supports partition and slack-space examination that a file-only export omits.
Incorrect Answers
A:A case involving persistent storage without starting the installed OS might use this approach: offline or dead-box acquisition reads storage through a controlled forensic environment, often with write protection; the required result here is raw storage including unallocated space. It cannot reconstruct volatile memory already lost at shutdown; it cannot replace proof about raw storage including unallocated space.
C:Although the case asks about raw storage including unallocated space, a raw image stores captured bytes without a proprietary evidence wrapper; the action instead concerns a straightforward sector byte stream. Hashes, device metadata and chain-of-custody information must be preserved separately; it does not establish raw storage including unallocated space.
D:For an analysis centered on volatile runtime secrets and process data, memory capture preserves a snapshot of volatile physical memory while the machine is running, though collection itself changes state; the present need is raw storage including unallocated space. Power loss would normally remove those volatile bytes; a different finding about raw storage including unallocated space is still needed.
Question 147
An investigation is limited by authorization to a known set of documents in a cloud-mounted directory. Which collection approach best matches the scope?
- Logical file acquisition
- Remote acquisition
- Physical disk image
- Live memory acquisition
Explanation
Correct Answer
A:Logical acquisition exports selected filesystem objects and available metadata without imaging the entire underlying device. It may omit deleted content and unrelated block data.
Incorrect Answers
B:For the separate question of forensic collection without on-site media removal, remote acquisition transfers evidence across a network with authenticated channels and integrity checks; the requested assessment of a constrained selection of accessible files remains open. Connectivity, host state and authorization must be documented; there is no direct finding about a constrained selection of accessible files.
C:The objective here is a constrained selection of accessible files; a physical acquisition covers addressable storage sectors beyond normal visible files, subject to access limitations; the option would instead inform raw storage including unallocated space. It supports partition and slack-space examination that a file-only export omits; it is not direct evidence of a constrained selection of accessible files.
D:For a separate investigation of volatile runtime secrets and process data, memory capture preserves a snapshot of volatile physical memory while the machine is running, though collection itself changes state; that is not the determination of a constrained selection of accessible files in the stem. Power loss would normally remove those volatile bytes; the evidence still must speak to a constrained selection of accessible files.
Question 148
A host contains an active malicious process and its decryption key may be in RAM. Which acquisition should occur before power removal?
- Remote acquisition
- Mobile filesystem extraction
- Live memory acquisition
- E01 forensic container
- Dead-box acquisition
Explanation
Correct Answer
C:Memory capture preserves a snapshot of volatile physical memory while the machine is running, though collection itself changes state. Power loss would normally remove those volatile bytes.
Incorrect Answers
A:Instead of a method addressing volatile runtime secrets and process data, remote acquisition transfers evidence across a network with authenticated channels and integrity checks; this one concerns forensic collection without on-site media removal. Connectivity, host state and authorization must be documented; it cannot independently determine volatile runtime secrets and process data.
B:In work concerning accessible mobile application filesystem artifacts, a filesystem extraction can expose accessible directory and application structures beyond a basic user-data backup; the operation would not resolve volatile runtime secrets and process data. Coverage depends strongly on device model, OS version and access level; the distinction leaves volatile runtime secrets and process data unsettled.
D:The required finding is about volatile runtime secrets and process data; EWF/E01 containers can store captured data with metadata, segmentation and integrity information; this addresses the separate concern of segmented forensic image with collection metadata. The container is still subject to verification and tool-compatibility checks; it does not by itself answer volatile runtime secrets and process data.
E:Although the case asks about volatile runtime secrets and process data, offline or dead-box acquisition reads storage through a controlled forensic environment, often with write protection; the action instead concerns persistent storage without starting the installed OS. It cannot reconstruct volatile memory already lost at shutdown; it does not establish volatile runtime secrets and process data.
Question 149
A powered-off seized computer must be examined without booting its installed operating system. Which approach fits?
- Cloud provider export
- Sparse logical capture
- Remote acquisition
- Dead-box acquisition
- Live memory acquisition
Explanation
Correct Answer
D:Offline or dead-box acquisition reads storage through a controlled forensic environment, often with write protection. It cannot reconstruct volatile memory already lost at shutdown.
Incorrect Answers
A:The current inquiry asks about persistent storage without starting the installed OS; provider-supported exports or APIs can retrieve scoped data and available audit metadata; this mechanism chiefly addresses hosted service records unavailable through local disk imaging. The export's completeness, retention and transformations need explicit documentation; it cannot prove persistent storage without starting the installed OS on its own.
B:In an inquiry concerning efficient collection without unallocated blocks, a targeted logical capture avoids copying irrelevant free blocks, reducing transfer volume; the scope does not extend to persistent storage without starting the installed OS. It cannot support the same deleted-sector analysis as a complete physical image; that issue cannot settle persistent storage without starting the installed OS.
C:Even though the scenario needs persistent storage without starting the installed OS, remote acquisition transfers evidence across a network with authenticated channels and integrity checks; the action relates to forensic collection without on-site media removal. Connectivity, host state and authorization must be documented; this remains insufficient for persistent storage without starting the installed OS.
E:The objective here is persistent storage without starting the installed OS; memory capture preserves a snapshot of volatile physical memory while the machine is running, though collection itself changes state; the option would instead inform volatile runtime secrets and process data. Power loss would normally remove those volatile bytes; it is not direct evidence of persistent storage without starting the installed OS.
Question 150
An acquisition needs segmented storage with associated metadata and optional compression rather than a plain byte stream. Which image format is a common choice?
- Logical file acquisition
- E01 forensic container
- Remote acquisition
- Raw dd image
Explanation
Correct Answer
B:EWF/E01 containers can store captured data with metadata, segmentation and integrity information. The container is still subject to verification and tool-compatibility checks.
Incorrect Answers
A:For questions about a constrained selection of accessible files, logical acquisition exports selected filesystem objects and available metadata without imaging the entire underlying device; that differs from segmented forensic image with collection metadata. It may omit deleted content and unrelated block data; it provides no direct answer to segmented forensic image with collection metadata.
C:Instead of a method addressing segmented forensic image with collection metadata, remote acquisition transfers evidence across a network with authenticated channels and integrity checks; this one concerns forensic collection without on-site media removal. Connectivity, host state and authorization must be documented; it cannot independently determine segmented forensic image with collection metadata.
D:In work concerning a straightforward sector byte stream, a raw image stores captured bytes without a proprietary evidence wrapper; the operation would not resolve segmented forensic image with collection metadata. Hashes, device metadata and chain-of-custody information must be preserved separately; the distinction leaves segmented forensic image with collection metadata unsettled.