Guide To Digital Forensics

Guide To Digital Forensics

Computer forensics or digital forensics is a time period in computer science to obtain authorized proof found in digital media or computers storage. With digital forensic investigation, the investigator can find what happened to the digital media akin to emails, hard disk, logs, computer system, and the network itself. In many case, forensic investigation can produce how the crime might happened and how we will shield ourselves in opposition to it subsequent time.

Some explanation why we need to conduct a forensic investigation: 1. To gather evidences in order that it can be used in courtroom to resolve authorized cases. 2. To investigate our network power, and to fill the security hole with patches and fixes. 3. To recuperate deleted recordsdata or any recordsdata in the event of hardware or software failure

In computer forensics, an important issues that should be remembered when conducting the investigation are:

1. The original evidence should 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 original storage medium and actual copy of the unique media. The difference between a bit-stream image and regular copy of the original storage is bit-stream image is the slack area within the storage. You will not find any slack space info on a replica media.

2. All forensic processes should follow the authorized laws in corresponding nation the place the crimes happened. Every country has totally 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 looking on 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 might happened. In a big firm, it is suggested to create a Digital Forensic Workforce or First Responder Staff, in order that the corporate could nonetheless protect the evidence till the forensic investigator come to the crime scene.

First Response guidelines are: 1. Under no circumstances ought to anybody, aside from Forensic Analyst, to make any makes an attempt to get well data from any hacked computer system or gadget that holds digital information. 2. Any try to retrieve the data by individual said in number 1, ought to be averted as it could compromise the integrity of the proof, by which grew to become inadmissible in legal court.

Based on that rules, it has already explained the important roles of having a First Responder Group in a company. The unqualified individual can only safe the perimeter so that nobody can touch the crime scene until Forensic Analyst has come (This may be executed by taking photo of the crime scene. They'll also make notes concerning the scene and who were current at that time.

Steps have to be taken when a digital crimes happenred in an expert means: 1. Safe the crime scene till the forensic analyst arrive.

2. Forensic Analyst must 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 photos has been taken.

4. If the computer continues to be powered on, don't turned off the computer. As an alternative, used a forensic instruments corresponding to Helix to get some information that can solely be found when the computer is still powered on, akin to information on RAM, and registries. Such tools has it is 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 of the evidences should be documented, during which chain of custody is used. Chain of Custody hold records on the evidence, such as: who has the evidence for the last time.

7. Securing the evidence must be accompanied by legal officer such as police as a formality.

8. Back in the lab, Forensic Analyst take the proof to create bit-stream image, as unique proof should not be used. Usually, Forensic Analyst will create 2-5 bit-stream image in case 1 image is corrupted. Of course Chain of Custody nonetheless used on this scenario to keep data of the evidence.

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

10. Forensic Analyst starts to search out evidence within the bit-stream image by rigorously wanting at the corresponding location is determined by what kind of crime has happened. For example: Short-term Internet Information, Slack Space, Deleted File, Steganography files.
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