Guide To Digital Forensics

Guide To Digital Forensics

Computer forensics or digital forensics is a time period in computer science to obtain 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 could occurred and how we will protect ourselves towards it subsequent time.

Some reasons why we need to conduct a forensic investigation: 1. To assemble evidences in order that it may be used in court docket to unravel authorized cases. 2. To investigate our network energy, and to fill the security gap with patches and fixes. 3. To recuperate deleted information or any information in the event of hardware or software program failure

In computer forensics, a very powerful things that should be remembered when conducting the investigation are:

1. The original proof should not be altered in anyways, and to do conduct the process, forensic investigator should make a bit-stream image. Bit-stream image is a little by little copy of the unique storage medium and actual copy of the unique media. The difference between a bit-stream image and normal copy of the original storage is bit-stream image is the slack space within the storage. You will not find any slack area information on a duplicate media.

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

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

Forensic investigators would usually wanting at 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 an enormous firm, it's recommended to create a Digital Forensic Team or First Responder Staff, so that the company could nonetheless preserve the proof till the forensic investigator come to the crime scene.

First Response rules are: 1. By no means should anybody, except for Forensic Analyst, to make any makes an attempt to get better data from any computer system or gadget that holds digital information. 2. Any try to retrieve the data by particular person mentioned in number 1, ought to be averted as it may compromise the integrity of the proof, in which became inadmissible in legal court.

Based mostly on that guidelines, it has already defined the important roles of getting a First Responder Team in a company. The unqualified individual can solely secure the perimeter in order that nobody can contact the crime scene until Forensic Analyst has come (This can be done by taking photograph of the crime scene. They will additionally make notes concerning the scene and who were current at that time.

Steps need to be taken when a digital crimes occurred in knowledgeable approach: 1. Safe 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 a picture 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, do not turned off the computer. Instead, used a forensic tools such as Helix to get some info that may solely be found when the computer is still powered on, such as information on RAM, and registries. Such instruments has it's particular operate 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 must be documented, burnaby wherein chain of custody is used. Chain of Custody keep records on the proof, corresponding to: who has the evidence for the last time.

7. Securing the proof have to be accompanied by authorized officer similar to police as a formality.

8. Back in the lab, Forensic Analyst take the proof 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 in this state of affairs 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 completely different hash, which makes the evidences found grow to be inadmissible in court.

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