Guide To Digital Forensics

Guide To Digital Forensics

Computer forensics or digital forensics is a time period in computer science to acquire legal proof found in digital media or computers storage. With digital forensic investigation, the investigator can discover what happened 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 could happened and the way we are able to defend ourselves against it subsequent time.

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

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

1. The unique proof should 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 precise copy of the original 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 discover any slack house data on a copy media.

2. All forensic processes must follow the authorized legal guidelines in corresponding country the place the crimes happened. Every nation has different regulation suit in IT field. Some take IT guidelines very significantly, for instance: United Kingdom, Australia.

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

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

First Response rules are: 1. By no means should anyone, with the exception of Forensic Analyst, to make any attempts to recuperate data from any computer system or device that holds digital information. 2. Any try to retrieve the info by individual mentioned in number 1, should be averted as it might compromise the integrity of the proof, in which turned inadmissible in authorized court.

Based on that guidelines, it has already defined the necessary roles of having a First Responder Staff in a company. The unqualified person can solely secure the perimeter in order that nobody can touch the crime scene till Forensic Analyst has come (This can be achieved by taking photograph of the crime scene. They'll also make notes concerning the scene and who were present at that time.

Steps must be taken when a digital crimes occurred in an expert approach: 1. Secure the crime scene till the forensic analyst arrive.

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

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

4. If the computer remains to be powered on, do not turned off the computer. As a substitute, used a forensic instruments resembling Helix to get some information that may solely be found when the computer remains to be powered on, such as knowledge 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 evidence is collected, Forensic Analyst cant turned off the computer and take harddisk back to forensic lab.

6. All of the evidences have to be documented, in which chain of custody is used. Chain of Custody maintain information on the proof, comparable to: tablet who has the evidence for the final time.

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

8. Back in the lab, Forensic Analyst take the evidence 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 nonetheless used in this situation to keep information of the evidence.

9. Hash of the original evidence 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 totally different hash, which makes the evidences found turn into inadmissible in court.

10. Forensic Analyst starts to seek out evidence in the bit-stream image by fastidiously trying on the corresponding location will depend on what sort of crime has happened. For example: Short-term Internet Recordsdata, Slack House, Deleted File, Steganography files.