HomeGuide To Digital Forensics
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 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 can defend ourselves towards it subsequent time.

Some explanation why we need to conduct a forensic investigation: 1. To assemble evidences so that it can be utilized in courtroom to resolve authorized cases. 2. To research our network strength, and to fill the security gap with patches and fixes. 3. To recuperate deleted files or any information in the event of hardware or software program failure

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

1. The unique evidence must not be altered in in any case, and to do conduct the process, forensic investigator should make a bit-stream image. Bit-stream image is a bit by bit copy of the unique storage medium and actual copy of the original media. The distinction between a bit-stream image and regular copy of the original storage is bit-stream image is the slack house within the storage. You will not discover any slack space data on a copy media.

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

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

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

First Response rules are: 1. By no means should anybody, apart from Forensic Analyst, to make any attempts to get well data from any computer system or machine that holds digital information. 2. Any try to retrieve the info by particular person said in number 1, needs to be avoided because it could compromise the integrity of the evidence, through which turned inadmissible in legal court.

Primarily based on that guidelines, it has already defined the important roles of getting a First Responder Workforce in a company. The unqualified person can only secure the perimeter so that no one can contact the crime scene till Forensic Analyst has come (This can be executed by taking photograph of the crime scene. They will additionally make notes about the scene and who have been current at that time.

Steps must be taken when a digital crimes happenred in a professional method: 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 images has been taken.

4. If the computer is still powered on, do not turned off the computer. As an alternative, used a forensic instruments equivalent to Helix to get some information that may only be found when the computer continues to be powered on, resembling knowledge on RAM, and registries. Such tools has it is special operate as not to write anything 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 must be documented, during which chain of custody is used. Chain of Custody preserve information on the proof, reminiscent of: who has the proof for the last time.

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

8. Back within the lab, Forensic Analyst take the proof to create bit-stream image, as original proof should not be used. Usually, Forensic Analyst will create 2-5 bit-stream image in case 1 image is corrupted. After all Chain of Custody still used in this state of affairs to keep records of the evidence.

9. Hash of the original evidence and bit-stream image is created. This acts as a proof that authentic proof 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 change into inadmissible in court.

10. Forensic Analyst begins to search out evidence within the bit-stream image by fastidiously trying at the corresponding location is dependent upon what kind of crime has happened. For instance: Momentary Internet Information, Slack House, Deleted File, Steganography files.