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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 discover what happened to the digital media such as emails, hard disk, logs, computer system, and the network itself. In lots of case, forensic investigation can produce how the crime might occurred and the way we can protect ourselves against it next time.

Some reasons why we need to conduct a forensic investigation: 1. To assemble evidences in order that it may be utilized in courtroom to resolve legal cases. 2. To research our network power, and to fill the security gap with patches and fixes. 3. To get well deleted files or any information in the event of hardware or software program failure

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

1. The original proof should not be altered in anyhow, 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 exact copy of the unique media. The difference between a bit-stream image and regular copy of the unique storage is bit-stream image is the slack area in the storage. You will not find any slack house data on a copy media.

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

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

Forensic investigators would usually wanting at the timeline of how the crimes occurred in well timed manner. With that, we can produce the crime scene about how, when, what and why crimes may happened. In an enormous firm, it is steered to create a Digital Forensic Workforce or First Responder Workforce, so that the corporate might still preserve the proof till the forensic investigator come to the crime scene.

First Response guidelines are: 1. In no way ought to anyone, excluding Forensic Analyst, to make any attempts to recuperate information from any computer system or gadget that holds digital information. 2. Any try to retrieve the data by particular person mentioned in number 1, needs to be averted because it may compromise the integrity of the evidence, wherein grew to become inadmissible in authorized court.

Primarily based on that guidelines, it has already defined the important roles of getting a First Responder Team in a company. The unqualified person can solely safe the perimeter so that no one can touch the crime scene till Forensic Analyst has come (This may be performed by taking photograph of the crime scene. They can also make notes concerning the scene and who have been present at that time.

Steps need to be taken when a digital crimes occurred in an expert way: 1. Secure the crime scene until 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 an image of the crime scene in case of if there is no such thing as a any images has been taken.

4. If the computer remains to be powered on, don't turned off the computer. As a substitute, used a forensic tools akin to Helix to get some data that may only be discovered when the computer remains to be powered on, reminiscent of knowledge on RAM, and registries. Such tools has it is particular function as not to write anything back to the system so the integrity keep intake.

5. Once 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, during which chain of custody is used. Chain of Custody maintain data on the proof, corresponding to: who has the evidence for the final time.

7. Securing the evidence should be accompanied by authorized officer similar to police as a formality.

8. Back in 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. In fact Chain of Custody still used in this situation to maintain data of the evidence.

9. Hash of the original 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 lead to different hash, which makes the evidences found change into inadmissible in court.

10. Forensic Analyst starts to seek out evidence within the bit-stream image by carefully trying on the corresponding location is determined by what kind of crime has happened. For instance: Temporary Internet Information, Slack House, Deleted File, Steganography files.


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