Guide To Digital Forensics

Guide To Digital Forensics

Computer forensics or digital forensics is a term in computer science to obtain authorized evidence present in digital media or computers storage. With digital forensic investigation, the investigator can find what happened to the digital media akin 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 the way we are able to protect ourselves in opposition to it next time.

Some the reason why we need to conduct a forensic investigation: 1. To gather evidences so that it can be utilized in courtroom to resolve authorized cases. 2. To research our network energy, and to fill the safety gap with patches and fixes. 3. To get better deleted information or any information in the occasion of hardware or software program failure

In computer forensics, the most important things that must be remembered when conducting the investigation are:

1. The original evidence must not be altered in anyways, and to do conduct the process, 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 unique media. The difference between a bit-stream image and regular copy of the original storage is bit-stream image is the slack house within the storage. You will not find any slack area data on a replica media.

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

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

Forensic investigators would usually trying at the timeline of how the crimes happened in timely manner. With that, we can produce the crime scene about how, when, what and why crimes could happened. In a giant firm, it is steered to create a Digital Forensic Group or First Responder Crew, in order that the corporate could still preserve the proof until the forensic investigator come to the crime scene.

First Response rules are: 1. Certainly not ought to anyone, excluding Forensic Analyst, to make any attempts to recover info from any computer system or machine that holds digital information. 2. Any try to retrieve the information by particular person said in number 1, ought to be prevented because it may compromise the integrity of the evidence, by which became inadmissible in authorized court.

Based on that rules, it has already defined the important roles of having a First Responder Team in a company. The unqualified person can solely secure the perimeter so that no one can contact the crime scene till Forensic Analyst has come (This can be completed by taking picture of the crime scene. They can also make notes in regards to the scene and who had been present at that time.

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

2. Forensic Analyst should request for the search warrant from native authorities or firm's management.

3. Forensic Analyst make take a picture of the crime scene in case of if there is no any pictures has been taken.

4. If the computer is still powered on, do not turned off the computer. Instead, used a forensic tools corresponding to Helix to get some info that may only be found when the computer remains to be powered on, corresponding to knowledge on RAM, and registries. Such instruments has it's special function as not to write something back to the system so the integrity stay 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 must be documented, in which chain of custody is used. Chain of Custody preserve records on the proof, such as: who has the proof for the final time.

7. Securing the proof must 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 unique proof must not be used. Normally, 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 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 precise 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 starts to search out proof in the bit-stream image by carefully looking at the corresponding location is dependent upon what kind of crime has happened. For example: Momentary Internet Recordsdata, Slack Area, Deleted File, Steganography files.