Information To Digital Forensics

Information To Digital Forensics

Computer dfi 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 occurred to the digital media resembling emails, hard disk, logs, computer system, and the network itself. In lots of case, forensic investigation can produce how the crime may occurred and how we can defend ourselves in opposition to it next time.

Some explanation why we have to conduct a forensic investigation: 1. To collect evidences in order that it may be utilized in court docket to resolve authorized cases. 2. To analyze our network strength, and to fill the security gap with patches and fixes. 3. To recover deleted recordsdata or any files in the occasion of hardware or software program failure

In computer forensics, crucial things that need to be remembered when conducting the investigation are:

1. The unique proof should not be altered in anyways, 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 unique storage medium and exact copy of the original media. The difference between a bit-stream image and normal copy of the original storage is bit-stream image is the slack area within the storage. You will not discover any slack house data on a replica media.

2. All forensic processes should comply with the authorized laws in corresponding nation the place the crimes happened. Each nation has different legislation suit in IT field. Some take IT rules very severely, for instance: United Kingdom, Australia.

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

Forensic investigators would normally wanting on the timeline of how the crimes happened in well timed manner. With that, we can produce the crime scene about how, when, what and why crimes might happened. In an enormous firm, it is urged to create a Digital Forensic Workforce or First Responder Group, in order that the corporate may nonetheless preserve the proof till the forensic investigator come to the crime scene.

First Response guidelines are: 1. On no account should anyone, except for Forensic Analyst, to make any attempts to recuperate info from any computer system or system that holds digital information. 2. Any try and retrieve the data by particular person said in number 1, must be avoided because it could compromise the integrity of the proof, by which grew to become inadmissible in legal court.

Primarily based on that guidelines, it has already explained the vital roles of getting a First Responder Group in a company. The unqualified individual can solely secure the perimeter so that no one can contact the crime scene until Forensic Analyst has come (This can be done by taking photograph of the crime scene. They can also make notes in regards to the scene and who were current at that time.

Steps need to be taken when a digital crimes occurred in a professional way: 1. Safe 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 an image of the crime scene in case of if there is no any pictures has been taken.

4. If the computer is still powered on, do not turned off the computer. As an alternative, used a forensic tools such as Helix to get some info that may only be found when the computer is still powered on, comparable to knowledge on RAM, and registries. Such instruments has it's special function as not to 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 preserve data on the proof, such as: who has the proof for the final time.

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

8. Back within the lab, Forensic Analyst take the proof to create bit-stream image, as unique evidence should not be used. Usually, Forensic Analyst will create 2-5 bit-stream image in case 1 image is corrupted. In fact Chain of Custody still used on this situation to maintain data of the evidence.

9. Hash of the original 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 lead to different hash, which makes the evidences found grow to be inadmissible in court.

10. Forensic Analyst starts to seek out evidence in the bit-stream image by rigorously looking at the corresponding location is dependent upon what kind of crime has happened. For example: Momentary Internet Files, Slack Area, Deleted File, Steganography files.