Guide To Digital Forensics

Guide To Digital Forensics

Computer forensics or digital forensics is a term in computer science to acquire authorized proof present in digital media or computers storage. With digital forensic investigation, the investigator can discover what happened to the digital media akin to emails, hard disk, logs, computer system, and the network itself. In lots of case, forensic investigation can produce how the crime may happened and how we will defend ourselves in opposition to it subsequent time.

Some reasons why we need to conduct a forensic investigation: 1. To collect evidences in order that it may be used in court to resolve authorized cases. 2. To research our network power, and to fill the safety gap with patches and fixes. 3. To recuperate deleted files or any information in the occasion of hardware or software program failure

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

1. The unique evidence 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 little by little copy of the unique storage medium and actual copy of the original media. The difference 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 area information on a copy media.

2. All forensic processes should follow the legal laws in corresponding country where the crimes happened. Each country has totally different divorce law suit in IT field. Some take IT guidelines very significantly, for example: United Kingdom, Australia.

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

Forensic investigators would usually trying at the timeline of how the crimes happened in well timed manner. With that, we are able to produce the crime scene about how, when, what and why crimes could happened. In a giant company, it is suggested to create a Digital Forensic Group or First Responder Workforce, so that the company could still protect the evidence until the forensic investigator come to the crime scene.

First Response guidelines are: 1. Under no circumstances ought to anybody, excluding Forensic Analyst, to make any makes an attempt to get well data from any computer system or system that holds digital information. 2. Any try and retrieve the info by individual stated in number 1, needs to be averted because it could compromise the integrity of the evidence, wherein grew to become inadmissible in authorized court.

Based on that rules, it has already defined the important roles of having a First Responder Crew in a company. The unqualified person can solely secure the perimeter so that nobody can contact the crime scene till Forensic Analyst has come (This may be completed by taking photograph of the crime scene. They'll additionally make notes concerning the scene and who were present at that time.

Steps have to be taken when a digital crimes occurred in knowledgeable method: 1. Secure the crime scene till the forensic analyst arrive.

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

3. Forensic Analyst make take an image 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 tools similar to 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 tools has it's special function as to not write something back to the system so the integrity stay intake.

5. As soon as all live evidence is collected, Forensic Analyst cant turned off the computer and take harddisk back to forensic lab.

6. All of the evidences should be documented, through which chain of custody is used. Chain of Custody hold information on the proof, corresponding to: who has the proof for the last time.

7. Securing the evidence should be accompanied by legal officer akin to police as a formality.

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

9. Hash of the unique evidence and bit-stream image is created. This acts as a proof that original evidence and the bit-stream image is the precise 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 starts to find evidence within the bit-stream image by carefully trying at the corresponding location relies on what sort of crime has happened. For instance: Temporary Internet Files, Slack House, Deleted File, Steganography files.