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Re: Lesson 06 Discussion Question Essay

2837 words - 12 pages

Guide to Computer Forensics and Investigations Fourth Edition
Chapter 4 Data Acquisition

• List digital evidence storage formats • Explain ways to determine the best acquisition method • Describe contingency planning for data acquisitions • Explain how to use acquisition tools

Guide to Computer Forensics and Investigations


Objectives (continued)
• Explain how to validate data acquisitions • Describe RAID acquisition methods • Explain how to use remote network acquisition tools • List other forensic tools available for data acquisitions

Guide to Computer Forensics and Investigations


Understanding Storage Formats for Digital Evidence
• Three formats
...view middle of the document...

afd for segmented image files and .afm for AFF metadata • AFF is open source

Guide to Computer Forensics and Investigations


Determining the Best Acquisition Method
• Types of acquisitions
– Static acquisitions and live acquisitions

• Four methods
– – – – Bit-stream disk-to-image file Bit-stream disk-to-disk Logical disk-to-disk or disk-to-disk data Sparse data copy of a file or folder

Guide to Computer Forensics and Investigations


Determining the Best Acquisition Method (continued)
• Bit-stream disk-to-image file
– – – – Most common method Can make more than one copy Copies are bit-for-bit replications of the original drive ProDiscover, EnCase, FTK, SMART, Sleuth Kit, XWays, iLook

• Bit-stream disk-to-disk
– When disk-to-image copy is not possible – Consider disk’s geometry configuration – EnCase, SafeBack, SnapCopy
Guide to Computer Forensics and Investigations 10

Determining the Best Acquisition Method (continued)
• Logical acquisition or sparse acquisition
– When your time is limited – Logical acquisition captures only specific files of interest to the case – Sparse acquisition also collects fragments of unallocated (deleted) data – For large disks – PST or OST mail files, RAID servers

Guide to Computer Forensics and Investigations


Determining the Best Acquisition Method (continued)
• When making a copy, consider:
– Size of the source disk
• Lossless compression might be useful • Use digital signatures for verification

– When working with large drives, an alternative is using tape backup systems – Whether you can retain the disk

Guide to Computer Forensics and Investigations


Contingency Planning for Image Acquisitions
• Create a duplicate copy of your evidence image file • Make at least two images of digital evidence
– Use different tools or techniques

• Copy host protected area of a disk drive as well
– Consider using a hardware acquisition tool that can access the drive at the BIOS level

• Be prepared to deal with encrypted drives
– Whole disk encryption feature in Windows Vista Ultimate and Enterprise editions
Guide to Computer Forensics and Investigations 13

Using Acquisition Tools
• Acquisition tools for Windows
– Advantages
• Make acquiring evidence from a suspect drive more convenient – Especially when used with hot-swappable devices

– Disadvantages
• Must protect acquired data with a well-tested writeblocking hardware device • Tools can’t acquire data from a disk’s host protected area

Guide to Computer Forensics and Investigations


Windows XP Write-Protection with USB Devices
• USB write-protection feature
– Blocks any writing to USB devices

• Target drive needs to be connected to an internal PATA (IDE), SATA, or SCSI controller • Steps to update the Registry for Windows XP SP2
– Back up the Registry – Modify the Registry with the write-protection feature – Create two desktop icons to automate switching between enabling...

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