HomeInformation To Digital Forensics
Information To Digital Forensics

Information To Digital Forensics

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

Some explanation why we need to conduct a forensic investigation: 1. To collect evidences so that it can be used in court docket to resolve legal cases. 2. To investigate our network power, and to fill the safety hole with patches and fixes. 3. To get well deleted information or any recordsdata in the occasion of hardware or software failure

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

1. The original evidence must not be altered in in any case, and to do conduct the method, 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 distinction between a bit-stream image and regular copy of the unique storage is bit-stream image is the slack area in the storage. You will not discover any slack area info on a copy media.

2. All forensic processes should observe the legal legal guidelines in corresponding country the place the crimes happened. Every country has totally different law suit in IT field. Some take IT guidelines very critically, for example: United Kingdom, Australia.

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

Forensic investigators would usually wanting on the timeline of how the crimes happened in timely manner. With that, we can produce the crime scene about how, when, what and why crimes might happened. In a giant company, it's recommended to create a Digital Forensic Group or First Responder Staff, in order that the company could nonetheless protect the evidence till the forensic investigator come to the crime scene.

First Response guidelines are: 1. Not at all should anyone, aside from Forensic Analyst, to make any attempts to get well info from any computer system or system that holds electronic information. 2. Any attempt to retrieve the data by person mentioned in number 1, needs to be avoided as it might compromise the integrity of the proof, by which turned inadmissible in authorized court.

Primarily based on that rules, it has already defined the essential roles of having a First Responder Group in a company. The unqualified particular person can solely secure the perimeter so that nobody can touch the crime scene till Forensic Analyst has come (This can be performed by taking photograph of the crime scene. They'll additionally make notes concerning the scene and who were current at that time.

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

2. Forensic Analyst should request for the search warrant from local authorities or firm'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 pictures has been taken.

4. If the computer continues to be powered on, do not turned off the computer. As an alternative, used a forensic tools resembling Helix to get some info that may solely be found when the computer is still powered on, corresponding to data on RAM, and registries. Such instruments has it's special 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 the evidences should be documented, during which chain of custody is used. Chain of Custody preserve information on the evidence, such as: who has the evidence for the last time.

7. Securing the evidence have to 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 original evidence 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 still used on this situation to maintain records of the evidence.

9. Hash of the unique evidence and bit-stream image is created. This acts as a proof that unique evidence 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 found become inadmissible in court.

10. Forensic Analyst starts to find proof in the bit-stream image by fastidiously trying on the corresponding location depends on what sort of crime has happened. For instance: Non permanent Internet Information, Slack House, Deleted File, Steganography files.