Information To Digital Forensics

Information To Digital Forensics

Computer forensics or digital forensics is a term in computer science to acquire legal evidence found in digital media or computers storage. With digital forensic investigation, the investigator can find 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 might happened and the way we will defend ourselves towards it next time.

Some the explanation why we need to conduct a forensic investigation: 1. To assemble evidences so that it may be utilized in court docket to resolve authorized cases. 2. To research our network energy, and to fill the safety hole with patches and fixes. 3. To get well deleted files or any files within the event of hardware or software failure

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

1. The original evidence 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 original media. The difference 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 discover any slack house info on a duplicate media.

2. All forensic processes must comply with the legal legal guidelines in corresponding country where the crimes happened. Each country has totally different regulation suit in IT field. Some take IT guidelines very critically, for example: United Kingdom, Australia.

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

Forensic investigators would normally wanting on the timeline of how the crimes occurred in timely manner. With that, we are able to produce the crime scene about how, when, what and why crimes may happened. In a big company, it is instructed to create a Digital Forensic Team or First Responder Crew, in order that the corporate may still preserve the proof until the forensic investigator come to the crime scene.

First incident response rules are: 1. Under no circumstances ought to anyone, apart from Forensic Analyst, to make any attempts to get well info from any computer system or device that holds electronic information. 2. Any try and retrieve the information by particular person said in number 1, ought to be avoided because it may compromise the integrity of the proof, by which grew to become inadmissible in authorized court.

Primarily based on that guidelines, it has already explained the vital roles of getting a First Responder Group in a company. The unqualified particular person can solely secure the perimeter in order that no one can touch the crime scene till Forensic Analyst has come (This can be completed by taking picture of the crime scene. They'll also make notes in regards to the scene and who have been present at that time.

Steps have to be taken when a digital crimes happenred in a professional approach: 1. Secure the crime scene until the forensic analyst arrive.

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

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

4. If the computer is still powered on, don't turned off the computer. As a substitute, used a forensic tools resembling Helix to get some info that may only be discovered when the computer is still powered on, equivalent to data on RAM, and registries. Such instruments has it's special operate 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 the evidences should be documented, through which chain of custody is used. Chain of Custody maintain information on the evidence, comparable to: who has the proof for the last time.

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

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

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

10. Forensic Analyst begins to seek out proof in the bit-stream image by rigorously looking at the corresponding location is determined by what sort of crime has happened. For example: Non permanent Internet Files, Slack House, Deleted File, Steganography files.

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