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Information To Digital Forensics

Information To Digital Forensics

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

Some the explanation why we have to conduct a forensic investigation: 1. To collect evidences so that it can be utilized in courtroom to resolve legal cases. 2. To analyze our network strength, and to fill the safety hole with patches and fixes. 3. To get well deleted information or any information within the event of hardware or software program failure

In computer forensics, a very powerful things that have to be remembered when conducting the investigation are:

1. The unique proof must not be altered in in any case, 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 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 space in the storage. You will not discover any slack area data on a duplicate media.

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

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

Forensic investigators would normally looking 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 could happened. In an enormous firm, it's urged to create a Digital Forensic Team or kelowna First Responder Team, in order that the corporate might nonetheless preserve the evidence until the forensic investigator come to the crime scene.

First Response guidelines are: 1. On no account ought to anyone, aside from Forensic Analyst, to make any makes an attempt to recuperate data from any computer system or system that holds digital information. 2. Any attempt to retrieve the info by individual stated in number 1, needs to be averted because it might compromise the integrity of the evidence, by which became inadmissible in legal court.

Based mostly on that guidelines, it has already explained the necessary roles of having a First Responder Crew in a company. The unqualified person can only safe the perimeter so that no one can contact the crime scene until Forensic Analyst has come (This can be completed by taking photograph of the crime scene. They can also make notes concerning the scene and who have been current at that time.

Steps need to be taken when a digital crimes occurred in an expert method: 1. Secure the crime scene until 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 an image of the crime scene in case of if there isn't a any images has been taken.

4. If the computer is still powered on, don't turned off the computer. As a substitute, used a forensic instruments resembling Helix to get some info that may solely be discovered when the computer is still powered on, comparable to information on RAM, and registries. Such instruments has it's particular perform as to not write something back to the system so the integrity stay 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, by which chain of custody is used. Chain of Custody keep data on the evidence, corresponding to: who has the proof for the final time.

7. Securing the proof must be accompanied by authorized officer such as police as a formality.

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

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

10. Forensic Analyst starts to search out evidence within the bit-stream image by rigorously wanting at the corresponding location will depend on what kind of crime has happened. For instance: Non permanent Internet Files, Slack House, Deleted File, Steganography files.