Information to Digital Forensics

Computer forensics or digital forensics is a term in computer science to acquire legal proof present in digital media or computers storage. With digital forensic investigation, the investigator can discover what happened to the digital media comparable to emails, hard disk, logs, computer system, and the network itself. In many case, forensic investigation can produce how the crime might occurred and how we can protect ourselves in opposition to it next time.

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

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

1. The original proof should not be altered in anyhow, and to do conduct the method, forensic investigator must make a bit-stream image. Bit-stream image is a bit by bit copy of the unique storage medium and tablet actual 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 within the storage. You’ll not find any slack house data on a replica media.

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

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

Forensic investigators would usually looking at 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 might happened. In a giant company, it’s instructed to create a Digital Forensic Workforce or First Responder Staff, so that the corporate might nonetheless preserve the evidence until the forensic investigator come to the crime scene.

First Response guidelines are: 1. By no means should anybody, apart from Forensic Analyst, to make any attempts to recover information from any computer system or gadget that holds digital information. 2. Any try to retrieve the information by particular person mentioned in number 1, must be averted as it may compromise the integrity of the evidence, by which became inadmissible in authorized court.

Based mostly on that guidelines, it has already explained the essential roles of getting a First Responder Group in a company. The unqualified individual can only safe the perimeter in order that no one can touch the crime scene until Forensic Analyst has come (This may be completed by taking photograph of the crime scene. They will additionally make notes in regards to the scene and who had been current at that time.

Steps need to be taken when a digital crimes occurred in knowledgeable means: 1. Safe the crime scene until 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 a picture of the crime scene in case of if there isn’t any any photos has been taken.

4. If the computer continues to be powered on, don’t turned off the computer. Instead, used a forensic tools resembling Helix to get some information that may only be found when the computer remains to be powered on, akin to data on RAM, and registries. Such instruments has it is particular operate as not to write something back to the system so the integrity stay intake.

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

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

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

8. Back in the lab, Forensic Analyst take the evidence to create bit-stream image, as unique proof must 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 scenario to keep data of the evidence.

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