Guide To Digital Forensics

Guide To Digital Forensics

Computer forensics or digital forensics is a term in computer science to obtain authorized proof present in digital media or computers storage. With digital forensic investigation, the investigator can find what occurred to the digital media reminiscent of emails, hard disk, logs, computer system, and the network itself. In lots of case, forensic investigation can produce how the crime may occurred and how we will defend ourselves against it next time.

Some the explanation why we need to conduct a forensic investigation: 1. To gather evidences in order that it may be used in courtroom to unravel legal cases. 2. To research our network power, and to fill the safety hole with patches and fixes. 3. To recover deleted files or any files within the event of hardware or software failure

In computer dfi forensics, crucial things that should be remembered when conducting the investigation are:

1. The original evidence must not be altered in anyways, and to do conduct the process, forensic investigator must make a bit-stream image. Bit-stream image is a bit by bit copy of the original storage medium and exact copy of the unique media. The distinction between a bit-stream image and normal copy of the unique storage is bit-stream image is the slack area in the storage. You will not find any slack area info on a replica media.

2. All forensic processes must comply with the authorized legal guidelines in corresponding nation the place the crimes happened. Every nation has completely different law suit in IT field. Some take IT guidelines very significantly, for example: United Kingdom, Australia.

3. All forensic processes can solely be carried out after the investigator has the search warrant.

Forensic investigators would usually wanting at the timeline of how the crimes happened in well timed manner. With that, we will produce the crime scene about how, when, what and why crimes may happened. In a giant firm, it's urged to create a Digital Forensic Crew or First Responder Crew, in order that the corporate might still preserve the evidence till the forensic investigator come to the crime scene.

First Response guidelines are: 1. By no means should anybody, with the exception of Forensic Analyst, to make any attempts to get better data from any computer system or gadget that holds electronic information. 2. Any try to retrieve the information by particular person stated in number 1, must be prevented because it may compromise the integrity of the evidence, in which became inadmissible in authorized court.

Primarily based on that guidelines, it has already explained the essential roles of having a First Responder Workforce in a company. The unqualified particular person can solely safe the perimeter in order that no one can contact the crime scene till Forensic Analyst has come (This can be completed by taking photo of the crime scene. They can additionally make notes in regards to the scene and who had been present at that time.

Steps need to be taken when a digital crimes occurred in an expert way: 1. Secure the crime scene till the forensic analyst arrive.

2. Forensic Analyst should request for the search warrant from native authorities or company's management.

3. Forensic Analyst make take a picture of the crime scene in case of if there is no such thing as a any photographs has been taken.

4. If the computer continues to be powered on, do not turned off the computer. Instead, used a forensic instruments corresponding to Helix to get some info that can only be found when the computer is still powered on, such as knowledge on RAM, and registries. Such tools has it is particular perform as not to write something back to the system so the integrity stay intake.

5. Once all live evidence is collected, Forensic Analyst cant turned off the computer and take harddisk back to forensic lab.

6. All of the evidences should be documented, in which chain of custody is used. Chain of Custody hold data on the evidence, reminiscent of: who has the proof for the final time.

7. Securing the evidence should be accompanied by authorized officer similar to police as a formality.

8. Back within the lab, Forensic Analyst take the proof to create bit-stream image, as original evidence should not be used. Normally, Forensic Analyst will create 2-5 bit-stream image in case 1 image is corrupted. Of course Chain of Custody nonetheless used on this state of affairs to keep information of the evidence.

9. Hash of the original proof and bit-stream image is created. This acts as a proof that unique proof and the bit-stream image is the exact copy. So any alteration on the bit image will end in totally different hash, which makes the evidences discovered become inadmissible in court.

10. Forensic Analyst starts to search out evidence in the bit-stream image by carefully trying at the corresponding location depends upon what sort of crime has happened. For example: Momentary Internet Recordsdata, Slack Space, Deleted File, Steganography files.