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Guide To Digital Forensics

Guide To Digital Forensics

Computer forensics or digital forensics is a term in computer science to acquire legal proof found in digital media or computers storage. With digital forensic investigation, the investigator can find what occurred to the digital media similar 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 how we can protect ourselves in opposition to it next time.

Some reasons why we have to conduct a forensic investigation: 1. To gather evidences in order that it may be utilized in courtroom to unravel authorized cases. 2. To investigate our network strength, and to fill the security hole with patches and fixes. 3. To recover deleted information or any information in the event of hardware or software failure

In computer forensics, an important things that should be remembered when conducting the investigation are:

1. The unique evidence must not be altered in anyways, 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 original storage medium and actual copy of the unique media. The distinction between a bit-stream image and normal copy of the unique storage is bit-stream image is the slack house within the storage. You will not discover any slack area information on a replica media.

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

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

Forensic investigators would normally looking at the timeline of how the crimes occurred in timely manner. With that, we can produce the crime scene about how, when, what and why crimes could happened. In a big company, it's advised to create a Digital Forensic Group or First Responder Workforce, so that the corporate may still preserve the proof till the forensic investigator come to the crime scene.

First Response guidelines are: 1. In no way ought to anyone, except for Forensic Analyst, to make any makes an attempt to recuperate 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 may compromise the integrity of the evidence, through which became inadmissible in authorized court.

Based mostly on that rules, it has already defined the vital roles of getting a First Responder Group in a company. The unqualified particular person can solely safe the perimeter in order that no one can contact the crime scene until Forensic Analyst has come (This can be achieved by taking photograph of the crime scene. They will also make notes about the scene and who had been current at that time.

Steps must be taken when a digital crimes happenred in knowledgeable approach: 1. Secure the crime scene till 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 an image 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, don't turned off the computer. Instead, used a forensic tools similar to Helix to get some data that can solely be found when the computer is still powered on, corresponding to data on RAM, and registries. Such tools has it is special perform as to not write something 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 the evidences should be documented, by which chain of custody is used. Chain of Custody hold data on the evidence, corresponding to: who has the proof for the final time.

7. Securing the proof must 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 unique proof should not be used. Usually, Forensic Analyst will create 2-5 bit-stream image in case 1 image is corrupted. After all Chain of Custody still used in this situation to keep information of the evidence.

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

10. Forensic Analyst begins to seek out proof within the bit-stream image by fastidiously trying at the corresponding location depends upon what sort of crime has happened. For example: Short-term Internet Recordsdata, Slack Space, Deleted File, Steganography files.

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