Difference between pages "Disk Imaging" and "Helix3 Pro"

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{{Infobox_Software |
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  name = Helix3 Pro |
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  maintainer = [[e-fense]]|
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  os = {{Linux}}, {{Windows}}, {{Mac OS X}} |
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  genre = {{Live CD}}, {{Incident Response}} |
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  license = {{GPL}}, others |
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  website = [http://www.e-fense.com/helix3pro.php e-fense.com]
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}}
  
Disk imaging is the process of making a bit-by-bit copy of a disk. Imaging (in more general terms) can apply to anything that can be considered as a bit-stream, e.g. a physical or logical volumes, network streams, etc.
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'''Helix3 Pro''' is a [[Live CD]] built on top of [[Ubuntu]]. It focuses on [[Incident Response|incident response]] and [[computer forensics]].
  
The most straight-forward disk imaging method is reading a disk from start to end and writing the data to a [[:Category:Forensics_File_Formats|Forensics image format]].
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== Tools Included ==
This can be a time consuming process especially for disks with a large capacity.
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== Hardware solutions ==
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* Live side for [[Mac OS X]], [[Windows]] and [[Linux]]
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* A bootable forensically sound environment based on [[Ubuntu]]
  
== Software solutions ==
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Open source forensic tools include:
  
== Compressed storage ==
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* [[dc3dd]]
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* [[aimage]]
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* [[The Sleuth Kit]] (3.0.1, with "light" version of [[Autopsy]], with [[libewf]] support)
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* [[foremost]]
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* [[Volatility]]
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* Several tools for mobile phone forensics
  
A common technique to reduce the size of an image file is to compress the data.
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Other tools include:
On modern computers, with multiple cores, the compression can be done in parallel reducing the output without prolonging the imaging process.
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* [[LinEn]]
Since the write speed of the target disk can be a bottleneck in imaging process parallel compression can reduce the total time of the imaging process.
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[[Guymager]] was one of the first imaging tools to implement the concept of multi-process compression for the [[Encase image file format]]. This technique is now used by various imaging tools including [http://www.tableau.com/index.php?pageid=products&model=TSW-TIM Tableau Imager (TIM)]
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Other techniques like storing the data sparse or '''empty-block compression''' can reduce the total time of the imaging process and the resulting size of new non-encrypted (0-byte filled) disks.
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== Forensic Issues ==
  
== Error tolerance and recovery ==
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* Helix3 Pro can automount some storage devices like firewire devices and MMC in read/write mode;
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* Helix3 Pro relies on file system drivers to provide write protection, mounting some file system types (e.g. [[XFS]]) will result in several data writes to the original media.
  
== Smart imaging ==
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== See Also ==
Smart imaging is a combination of techniques to make the imaging process more intelligent.
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* Deduplication
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* Selective imaging
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* Decryption while imaging
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=== Deduplication ===
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Free version: [[Helix3]]
Deduplication is the process of determining and storing data that occurs more than once on-disk, only once in the image.
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It is even possible to store the data once for a corpus of images using techniques like hash based imaging.
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=== Selective imaging ===
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Selective imaging is a technique to only make a copy of certain information on a disk like the $MFT on an [[NTFS]] volume with the necessary contextual information.
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[[EnCase]] Logical Evidence Format (LEF) is an example of a selective image.
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=== Decryption while imaging ===
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Encrypted data is worst-case scenario for compression. Because the encryption process should be deterministic a solution to reduce the size of an encrypted image is to store it non-encrypted and compressed and encrypt it on-the-fly if required. Although this should be rare since the non-encrypted data is what undergoes analysis.
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== Also see ==
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[[:Category:Forensics_File_Formats|Forensics File Formats]]
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== External Links ==
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* [http://www.tableau.com/pdf/en/Tableau_Forensic_Disk_Perf.pdf Benchmarking Hard Disk Duplication Performance in Forensic Applications], by [[Robert Botchek]]
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=== Hash based imaging ===
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* [http://www.dfrws.org/2010/proceedings/2010-314.pdf Hash based disk imaging using AFF4], by [[Michael Cohen]], [[Bradley Schatz]]
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Revision as of 04:39, 18 January 2014

Helix3 Pro
Maintainer: e-fense
OS: Linux,Windows,Mac OS X
Genre: Live CD, Template:Incident Response
License: GPL, others
Website: e-fense.com

Helix3 Pro is a Live CD built on top of Ubuntu. It focuses on incident response and computer forensics.

Tools Included

Open source forensic tools include:

Other tools include:

Forensic Issues

  • Helix3 Pro can automount some storage devices like firewire devices and MMC in read/write mode;
  • Helix3 Pro relies on file system drivers to provide write protection, mounting some file system types (e.g. XFS) will result in several data writes to the original media.

See Also

Free version: Helix3