Guide To Digital Forensics

Guide To Digital Forensics

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

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

In computer forensics, crucial issues that have to be remembered when conducting the investigation are:

1. The original proof must 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 precise copy of the unique media. The distinction between a bit-stream image and normal copy of the original storage is bit-stream image is the slack area in the storage. You'll not find any slack area information on a copy media.

2. All forensic processes must comply with the legal legal guidelines in corresponding country where the crimes happened. Each nation has different legislation suit in IT field. Some take IT rules very critically, for instance: United Kingdom, Australia.

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

Forensic investigators would usually looking on 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 may happened. In a big firm, it is advised to create a Digital Forensic Team or First Responder Group, so that the corporate might still preserve the proof until the forensic investigator come to the crime scene.

First Response guidelines are: 1. Not at all should anyone, with the exception of Forensic Analyst, to make any attempts to recover data from any computer system or machine that holds digital information. 2. Any try to retrieve the information by individual stated in number 1, needs to be prevented because it could compromise the integrity of the proof, during which became inadmissible in authorized court.

Based on that rules, it has already explained the necessary roles of having a First Responder Team in a company. The unqualified individual can only safe the perimeter so that no one can touch the crime scene till Forensic Analyst has come (This can be accomplished by taking photo of the crime scene. They can additionally make notes concerning the scene and who have been current at that time.

Steps must be taken when a digital crimes happenred in an expert method: 1. Secure 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 is no such thing as a any photos has been taken.

4. If the computer is still powered on, Calgary don't turned off the computer. Instead, used a forensic tools comparable to Helix to get some info that can solely be discovered when the computer is still powered on, such as knowledge on RAM, and registries. Such tools has it's particular function as to not 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 have to be documented, through which chain of custody is used. Chain of Custody hold data on the evidence, akin to: who has the evidence for the final time.

7. Securing the proof 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 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 nonetheless used in this state of affairs to keep records 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 result in totally different hash, which makes the evidences discovered develop into inadmissible in court.

10. Forensic Analyst begins to search out evidence in the bit-stream image by carefully wanting on the corresponding location depends upon what kind of crime has happened. For instance: Non permanent Internet Files, Slack Area, Deleted File, Steganography files.