Posts Tagged ‘CFI’

In digital Forensics, there are 2 types of acquisitions: 

  1. Static Acquisition: which is the preferred way to collect a digital evidence when a computer seized during police raid.
  2. Live Acquisition: is the way to collect digital evidence when a computer is powered on and the suspect has been logged on to. This type is preferred when the hard disk is encrypted with a password. 

For both types, there are 4 methods of collecting data: 

  1. 1.    Creating a disk-to-image file: the most common method to collect data. It allows the investigator to create on or many bit-for-bit replications of the original drive. By using this method, we can use any of the forensics tools such as ProDiscover, EnCase, FTK, X-ways, ILook, SMART, and Sleuth Kit to read the different types of disk-to-image files.
  2. 2.    Creating a disk-to-disk copy: is used when disk-to-image faces hardware of software errors due to incompatibilities. It copies the entire disk to a newer disk by using any of the forensics tools such as EnCase and SafeBack. These tools can adjust the target disk’s geometry to match the original drive.
  3. 3.    Creating a logical disk-to-disk or disk-to-data file: this is the preferred method with large data storage such as RAID servers. This method captures only specific files or file types of interest to the case. It is used when time is limited.
  4. 4.    Creating a sparse copy of a folder or file: this method is similar to creating a logical acquisition but it also collects deleted data (unallocated). Also this method is used when an investigator doesn’t need to examine the whole drive.

To determine the appropriate acquisition method, the investigator must consider the following:

  1. The size of the source disk.
  2. Can you retain the source disk as an evident or must you return it to the owner?
  3. Time to do perform the acquisition.
  4. Location of the evidence

 

Source: GCFI, 4th ed, Ch4

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