Guide To Digital Forensics

Guide 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 occurred to the digital media corresponding 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 can protect ourselves towards it next time.

Some explanation why we need to conduct a forensic investigation: 1. To collect evidences in order that it can be used in courtroom to unravel authorized cases. 2. To research our network energy, and to fill the safety gap with patches and fixes. 3. To get better deleted information or any recordsdata in the event of hardware or software program failure

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

1. The original evidence should not be altered in anyhow, and to do conduct the method, forensic investigator should make a bit-stream image. Bit-stream image is a bit by bit copy of the original 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 within the storage. You'll not find any slack house information on a copy media.

2. All forensic processes should follow the authorized laws in corresponding country where the crimes happened. Each country has completely different law suit in IT field. Some take IT rules very significantly, 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 company, it is recommended to create a Digital Forensic Team or First Responder Workforce, in order that the corporate may nonetheless protect the evidence until the forensic investigator come to the crime scene.

First Response guidelines are: 1. Not at all ought to anybody, apart from Forensic Analyst, to make any attempts to recuperate info from any computer system or device that holds digital information. 2. Any attempt to retrieve the data by person mentioned in number 1, must be avoided as it might compromise the integrity of the evidence, during which grew to become inadmissible in legal court.

Based on that rules, it has already explained the necessary roles of having a First Responder Crew in a company. The unqualified person can solely secure the perimeter in order that nobody can contact the crime scene until Forensic Analyst has come (This can be finished by taking picture of the crime scene. They'll also make notes about the scene and who had been current at that time.

Steps must be taken when a digital crimes occurred in an expert means: 1. Secure the crime scene till 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 a picture of the crime scene in case of if there isn't any any pictures has been taken.

4. If the computer is still powered on, do not turned off the computer. Instead, used a forensic instruments akin to Helix to get some info that can only be found when the computer is still powered on, such as information on RAM, harassment and registries. Such instruments has it's particular perform as to not write anything back to the system so the integrity keep intake.

5. As soon as 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 maintain information on the proof, similar to: who has the evidence for the final time.

7. Securing the proof have to 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 original evidence must not be used. Usually, Forensic Analyst will create 2-5 bit-stream image in case 1 image is corrupted. In fact Chain of Custody nonetheless used in this scenario to maintain data of the evidence.

9. Hash of the unique evidence and bit-stream image is created. This acts as a proof that original evidence and the bit-stream image is the exact copy. So any alteration on the bit image will end in totally different hash, which makes the evidences found grow to be inadmissible in court.

10. Forensic Analyst starts to find proof in the bit-stream image by fastidiously looking on the corresponding location depends upon what kind of crime has happened. For example: Momentary Internet Recordsdata, Slack House, Deleted File, Steganography files.