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 Investigationsġ0 Determining the Best Acquisition Method (continued)īit-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, X-Ways, 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 Investigationsġ1 Determining the Best Acquisition Method (continued) afm for AFF metadata AFF is open source Guide to Computer Forensics and Investigationsĩ Determining the Best Acquisition Method Garfinkel of Basis Technology Corporation Design goals Provide compressed or uncompressed image files No size restriction for disk-to-image files Provide space in the image file or segmented files for metadata Simple design with extensibility Open source for multiple platforms and OSs Guide to Computer Forensics and Investigationsĭesign goals (continued) Internal consistency checks for self-authentication File extensions include. Proprietary Formats Features offered Option to compress or not compress image files Can split an image into smaller segmented files Can integrate metadata into the image file Disadvantages Inability to share an image between different tools File size limitation for each segmented volume Guide to Computer Forensics and Investigationsĭeveloped by Dr. Raw Format Makes it possible to write bit-stream data to files Advantages Fast data transfers Can ignore minor data read errors on source drive Most computer forensics tools can read raw format Disadvantages Requires as much storage as original disk or data Tools might not collect marginal (bad) sectors Guide to Computer Forensics and InvestigationsĦ Guide to Computer Forensics and Investigations Three formats Raw format Proprietary formats Advanced Forensics Format (AFF) Guide to Computer Forensics and Investigationsĥ Guide to Computer Forensics and Investigations
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Objectives 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 InvestigationsĮxplain 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 InvestigationsĤ Understanding Storage Formats for Digital Evidence Let’s try it.1 Guide to Computer Forensics and Investigations Third EditionĢ Guide to Computer Forensics and Investigations That person can acquire the image and ship it to you and no one will be able to decrypt it, only you. Therefore, it is a safe method to give your public key to a person acquiring an image. He/she will not be able to decrypt it afterwards. A person who has access to the public key is allowed to encrypt the data, but since that person does not have the private key.
Thus, only the person can see the saved data who has the private key. In order to decrypt it later, you will need to apply the corresponding private key. In order to encrypt data, you will need the public key. The main idea is that you need to create two keys, one public and one private. Understanding Public Key Infrastructure ( PKI ) is very important and this exercise will help you understand it usage. In that case, you will allow the person acquiring the evidence physical access to the drive, but if you do not want that person to make a copy and later examine the image of the acquired drive, then you’ll need to protect it.
In some cases, you will have to collect evidence in a remote site or hire someone to collect the evidence for you.
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