Guide To Digital Forensics

Guide To Digital Forensics

Computer forensics or digital forensics is a term in computer science to acquire legal evidence present in digital media or computers storage. With digital forensic investigation, the investigator can find what occurred to the digital media akin to 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 are able to shield ourselves in opposition to it next time.

Some the explanation why we need to conduct a forensic investigation: 1. To gather evidences so that it can be used in court docket to resolve legal cases. 2. To analyze our network energy, and to fill the safety gap with patches and fixes. 3. To recuperate deleted files or any information in the occasion of hardware or software failure

In computer forensics, crucial issues that need to be remembered when conducting the investigation are:

1. The unique proof must not be altered in anyhow, 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 unique storage medium and precise copy of the unique media. The distinction between a bit-stream image and regular copy of the unique storage is bit-stream image is the slack space within the storage. You will not find any slack space information on a replica media.

2. All forensic processes should follow the authorized legal guidelines in corresponding nation the place the crimes happened. Every country has different regulation suit in IT field. Some take IT guidelines very critically, for instance: United Kingdom, Australia.

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

Forensic investigators would usually looking at the timeline of how the crimes occurred in well timed manner. With that, we can produce the crime scene about how, when, what and why crimes may happened. In a big firm, it's prompt to create a Digital Forensic Team or First Responder Group, in order that the company could still preserve the proof till the forensic investigator come to the crime scene.

First Response rules are: 1. Certainly not should anybody, except for Forensic Analyst, to make any makes an attempt to recover data from any computer system or device that holds electronic information. 2. Any try to retrieve the information by individual stated in number 1, should be avoided as it might compromise the integrity of the proof, by which turned inadmissible in legal court.

Based on that rules, it has already defined the essential roles of getting a First Responder Staff in a company. The unqualified particular person can only safe the perimeter so that nobody can contact the crime scene until Forensic Analyst has come (This can be achieved by taking picture of the crime scene. They can also make notes about the scene and who have been present at that time.

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

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

3. Forensic Analyst make take an image of the crime scene in case of if there isn't any any photos has been taken.

4. If the computer remains to be powered on, do not turned off the computer. Instead, android used a forensic tools reminiscent of Helix to get some information that may only be found when the computer remains to be powered on, similar to data on RAM, and registries. Such instruments has it's particular operate as to not write anything back to the system so the integrity keep intake.

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

6. All the evidences have to be documented, during which chain of custody is used. Chain of Custody hold data on the evidence, comparable to: who has the proof for the final time.

7. Securing the evidence have to be accompanied by authorized officer comparable to police as a formality.

8. Back in the lab, Forensic Analyst take the proof to create bit-stream image, as unique proof must not be used. Usually, Forensic Analyst will create 2-5 bit-stream image in case 1 image is corrupted. After all Chain of Custody nonetheless used in this situation to maintain information of the evidence.

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

10. Forensic Analyst starts to seek out evidence in the bit-stream image by rigorously looking on the corresponding location will depend on what kind of crime has happened. For instance: Short-term Internet Information, Slack Space, Deleted File, Steganography files.

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