Guide To Digital Forensics

Guide To Digital Forensics

Computer forensics or digital dfi forensics is a term in computer science to acquire legal evidence present in digital media or computers storage. With digital forensic investigation, the investigator can discover what occurred to the digital media comparable to emails, hard disk, logs, computer system, and the network itself. In lots of case, forensic investigation can produce how the crime may occurred and the way we are able to defend ourselves against it next time.

Some reasons why we need to conduct a forensic investigation: 1. To collect evidences so that it may be utilized in courtroom to solve authorized cases. 2. To research our network power, and to fill the security gap with patches and fixes. 3. To recuperate deleted files or any recordsdata within the occasion of hardware or software program failure

In computer forensics, the most 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 method, forensic investigator must make a bit-stream image. Bit-stream image is a little by little copy of the unique storage medium and precise copy of the original media. The difference between a bit-stream image and regular copy of the unique storage is bit-stream image is the slack house within the storage. You will not discover any slack area info on a duplicate media.

2. All forensic processes should observe the legal legal guidelines in corresponding nation the place the crimes happened. Each nation has completely different regulation suit in IT field. Some take IT guidelines very severely, for instance: United Kingdom, Australia.

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

Forensic investigators would normally 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 giant company, it is urged to create a Digital Forensic Workforce or First Responder Crew, in order that the corporate might nonetheless preserve the proof until the forensic investigator come to the crime scene.

First Response rules are: 1. On no account ought to anybody, excluding Forensic Analyst, to make any makes an attempt to recover data from any computer system or gadget that holds electronic information. 2. Any try to retrieve the information by individual mentioned in number 1, needs to be avoided because it might compromise the integrity of the proof, by which became inadmissible in authorized court.

Based on that rules, it has already defined the vital roles of getting a First Responder Crew in a company. The unqualified particular person can solely secure the perimeter so that nobody can touch the crime scene until Forensic Analyst has come (This may be achieved by taking picture of the crime scene. They will additionally make notes concerning the scene and who have been present at that time.

Steps have to be taken when a digital crimes happenred in a professional means: 1. Safe the crime scene till the forensic analyst arrive.

2. Forensic Analyst should 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 is no such thing as a any photos has been taken.

4. If the computer continues to be powered on, don't turned off the computer. Instead, used a forensic instruments reminiscent of Helix to get some info that may solely be found when the computer continues to be powered on, equivalent to knowledge on RAM, and registries. Such tools has it is particular operate as to not write something back to the system so the integrity stay 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 preserve records on the evidence, akin to: who has the proof for the final time.

7. Securing the evidence must be accompanied by authorized officer such as police as a formality.

8. Back in 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 still used on this scenario 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 proof 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 found grow to be inadmissible in court.

10. Forensic Analyst starts to seek out proof in the bit-stream image by carefully wanting at the corresponding location is determined by what kind of crime has happened. For instance: Temporary Internet Recordsdata, Slack Space, Deleted File, Steganography files.

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