Guide To Digital Forensics

Guide To Digital Forensics

Computer forensics or digital forensics is a time period in computer science to obtain legal evidence present in digital media or computers storage. With digital forensic investigation, the investigator can discover what happened to the digital media equivalent to emails, hard disk, logs, computer system, and the network itself. In lots of case, forensic investigation can produce how the crime might happened and the way we are able to protect ourselves against it next time.

Some the explanation why we have to conduct a forensic investigation: 1. To gather evidences so that it can be utilized in court to resolve legal cases. 2. To research our network strength, and to fill the security hole with patches and fixes. 3. To get better deleted recordsdata or any recordsdata within the event of hardware or software failure

In computer forensics, a very powerful issues that should be remembered when conducting the investigation are:

1. The original evidence must not be altered in anyhow, and to do conduct the method, forensic investigator should make a bit-stream image. Bit-stream image is a bit by bit copy of the unique storage medium and exact copy of the unique media. The distinction between a bit-stream image and regular copy of the original storage is bit-stream image is the slack space in the storage. You'll not discover any slack space info on a duplicate media.

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

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

Forensic investigators would usually trying 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 an enormous company, it is suggested to create a Digital Forensic Staff or First Responder Staff, so that the corporate might nonetheless preserve the evidence till the forensic investigator come to the crime scene.

First Response guidelines are: 1. By no means should anybody, except Forensic Analyst, to make any attempts to recover information from any computer system or machine that holds electronic information. 2. Any attempt to retrieve the data by person mentioned in number 1, needs to be prevented because it might compromise the integrity of the evidence, in which became inadmissible in legal court.

Primarily based on that rules, it has already defined the necessary roles of getting a First Responder Crew in a company. The unqualified person can only secure the perimeter so that no one can touch the crime scene until Forensic Analyst has come (This may be executed by taking photograph of the crime scene. They'll also make notes concerning the scene and who had been current at that time.

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

2. Forensic Analyst should request for the search warrant from native 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 photographs has been taken.

4. If the computer continues to be powered on, don't turned off the computer. As an alternative, used a forensic tools corresponding to Helix to get some information that may solely be found when the computer continues to be powered on, akin to information on RAM, and registries. Such instruments has it's special operate 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 of the evidences should be documented, wherein chain of custody is used. Chain of Custody keep data on the evidence, corresponding to: who has the evidence for the final time.

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

8. Back within the lab, Forensic Analyst take the evidence to create bit-stream image, as original evidence must not be used. Normally, Forensic Analyst will create 2-5 bit-stream image in case 1 image is corrupted. Of course Chain of Custody still used in this situation to maintain information of the evidence.

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

10. Forensic Analyst begins to seek out evidence within the bit-stream image by fastidiously looking at the corresponding location relies on what kind of crime has happened. For instance: Temporary Internet Files, Slack Area, Deleted File, Steganography files.
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