Guide To Digital Forensics

Guide To Digital Forensics

Computer forensics or digital forensics is a time period in computer science to acquire legal evidence found in digital media or computers storage. With digital forensic investigation, the investigator can discover what occurred to the digital media comparable to emails, hard disk, logs, computer system, and the network itself. In lots of case, forensic investigation can produce how the crime might occurred and the way we can shield ourselves in opposition to it subsequent time.

Some reasons why we need to conduct a forensic investigation: 1. To assemble evidences so that it can be used in court docket to unravel legal cases. 2. To research our network strength, and to fill the security gap with patches and fixes. 3. To get better deleted files or any recordsdata within the event of hardware or software program failure

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

1. The unique proof must not be altered in in any case, and to do conduct the process, forensic investigator must make a bit-stream image. Bit-stream image is a bit by bit copy of the unique storage medium and precise copy of the original media. The difference between a bit-stream image and regular copy of the original storage is bit-stream image is the slack space in the storage. You'll not discover any slack space data on a duplicate media.

2. All forensic processes must follow the legal laws in corresponding country the place the crimes happened. Each nation has completely different regulation suit in IT field. Some take IT guidelines very severely, for example: United Kingdom, Australia.

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

Forensic investigators would usually wanting at the timeline of how the crimes happened in well timed manner. With that, chilliwack we can produce the crime scene about how, when, what and why crimes may happened. In a giant company, it's instructed to create a Digital Forensic Team or First Responder Staff, in order that the company may nonetheless protect the proof till the forensic investigator come to the crime scene.

First Response rules are: 1. Not at all should anybody, except for Forensic Analyst, to make any makes an attempt to recover info from any computer system or gadget that holds digital information. 2. Any try to retrieve the info by individual mentioned in number 1, needs to be avoided as it might compromise the integrity of the evidence, by which grew to become inadmissible in authorized court.

Based on that rules, it has already defined the essential roles of having a First Responder Group in a company. The unqualified individual can only safe the perimeter in order that no one can touch the crime scene until Forensic Analyst has come (This may be executed by taking photograph of the crime scene. They can additionally make notes about the scene and who have been present at that time.

Steps should be taken when a digital crimes occurred in knowledgeable manner: 1. Safe the crime scene until the forensic analyst arrive.

2. Forensic Analyst must request for the search warrant from native authorities or company's management.

3. Forensic Analyst make take a picture of the crime scene in case of if there is no any pictures has been taken.

4. If the computer remains to be powered on, don't turned off the computer. Instead, used a forensic instruments corresponding to Helix to get some data that may solely be found when the computer continues to be powered on, resembling information on RAM, and registries. Such instruments has it's particular function as to not write something back to the system so the integrity keep 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, in which chain of custody is used. Chain of Custody keep information on the proof, comparable to: who has the proof for the last time.

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

8. Back within the lab, Forensic Analyst take the proof to create bit-stream image, as unique evidence must not be used. Normally, Forensic Analyst will create 2-5 bit-stream image in case 1 image is corrupted. Of course Chain of Custody still used on this state of affairs to keep information of the evidence.

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

10. Forensic Analyst begins to find proof in the bit-stream image by fastidiously wanting on the corresponding location is determined by what kind of crime has happened. For example: Temporary Internet Recordsdata, Slack House, Deleted File, Steganography files.

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