Guide To Digital Forensics

Guide To Digital Forensics

Computer forensics or digital forensics is a term in computer science to acquire authorized evidence found in digital media or computers storage. With digital forensic investigation, the investigator can find what occurred to the digital media reminiscent of emails, hard disk, logs, computer system, and the network itself. In many case, forensic investigation can produce how the crime may happened and how we are able to shield ourselves towards it next time.

Some reasons why we have to conduct a forensic investigation: 1. To gather evidences so that it may be used in court docket to resolve authorized cases. 2. To analyze our network power, and to fill the safety hole with patches and fixes. 3. To recuperate deleted recordsdata or any information in the event of hardware or software failure

In computer forensics, a very powerful issues 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 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 distinction between a bit-stream image and regular copy of the unique storage is bit-stream image is the slack space within the storage. You'll not find any slack area information on a copy media.

2. All forensic processes should follow the authorized legal guidelines in corresponding country where the crimes happened. Every country has totally different law suit in IT field. Some take IT rules very seriously, chilliwack for instance: United Kingdom, Australia.

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

Forensic investigators would normally looking on the timeline of how the crimes happened in well timed manner. With that, we will produce the crime scene about how, when, what and why crimes could happened. In a big firm, it is prompt to create a Digital Forensic Group or First Responder Workforce, so that the company may nonetheless preserve the evidence till the forensic investigator come to the crime scene.

First Response rules are: 1. Certainly not should anyone, excluding Forensic Analyst, to make any attempts to get better data from any computer system or device that holds digital information. 2. Any try to retrieve the data by individual said in number 1, needs to be prevented because it may compromise the integrity of the proof, by which grew to become inadmissible in authorized court.

Based on that guidelines, it has already defined the essential roles of getting a First Responder Crew in a company. The unqualified individual can solely safe the perimeter in order that nobody can touch the crime scene until Forensic Analyst has come (This can be done by taking photograph of the crime scene. They'll also make notes concerning the scene and who were current at that time.

Steps have to be taken when a digital crimes happenred in a professional method: 1. Secure the crime scene until the forensic analyst arrive.

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

3. Forensic Analyst make take a picture of the crime scene in case of if there isn't any any images has been taken.

4. If the computer continues to be powered on, do not turned off the computer. As a substitute, used a forensic instruments such as Helix to get some information that may only be found when the computer is still powered on, equivalent to knowledge on RAM, and registries. Such instruments has it's particular 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 of the evidences must be documented, wherein chain of custody is used. Chain of Custody keep data on the proof, comparable to: who has the evidence for the final time.

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

8. Back within the lab, Forensic Analyst take the evidence to create bit-stream image, as authentic evidence must not be used. Usually, Forensic Analyst will create 2-5 bit-stream image in case 1 image is corrupted. After all Chain of Custody nonetheless used on this state of affairs to maintain information of the evidence.

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

10. Forensic Analyst begins to seek out proof within the bit-stream image by rigorously wanting on the corresponding location depends on what kind of crime has happened. For example: Temporary Internet Information, Slack Area, Deleted File, Steganography files.