Computer Forensic Specialist - digital forensic - Network forensics

Computer Forensic science is a branch of forensic science Network forensics encompassing the recovery and investigation of material found in digital devices, often in relation to computer crime.[1][2] The term digital forensics was originally used as a synonym for computer forensics
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Network forensics generally has two uses. Network forensics The first, relating to security, involves monitoring a network for anomalous traffic and identifying intrusions. An attacker might be able to erase all log files on a compromised host; network-based evidence might therefore be the only evidence available for forensic analysis.[3]Network forensics relates to law enforcement. In this case analysis of captured network traffic can include tasks such as reassembling transferred files, searching for keywords and parsing human communication
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Computer crime, or Cybercrime, refers to any crime that involves a computer and a network.[1] The computer may have been used in the commission of a crime, or it may be the target
Cyberstalking is the use of the Internet or other electronic means to stalk or harass an individual, a group of individuals, or an organization.[1] It may include the making of false accusations or statements of fact , monitoring, making threats, identity theft, damage to data or equipment, the solicitation of minors for sex, or gathering information that may be used to harass.
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Computer forensic investigations usually follow the standard digital forensic process (acquisition, analysis and reporting).[7] Investigations are performed on static data (i.e. acquired images) rather than "live" systems. This is a change from early forensic practices where a lack of specialist tools led to investigators commonly working on live data.
Techniques
A number of techniques are used during computer forensics investigations.
Cross-drive analysis
A forensic technique that correlates information found on multiple hard drives. The process, still being researched, can be used to identify social networks and to perform anomaly detection.[9][10]
Live analysis
The examination of computers from within the operating system using custom forensics or existing sysadmin tools to extract evidence. The practice is useful when dealing with Encrypting File Systems, for example, where the encryption keys may be collected and, in some instances, the logical hard drive volume may be imaged (known as a live acquisition) before the computer is shut down.
Deleted files
A common technique used in computer forensics is the recovery of deleted files. Modern forensic software have their own tools for recovering or carving out deleted data.[11] Most operating systems and file systems do not always erase physical file data, allowing investigators to reconstruct it from the physical disk sectors. File carving involves searching for known file headers within the disk image and reconstructing deleted materials.
Stochastic forensics
A method which uses stochastic properties of the computer system to investigate activities lacking digital artifacts. Its chief use is to investigate data theft.
Steganography
One of the techniques used to hide data is via steganography, the process of hiding data inside of a picture or digital image. This process is often used to hide pornographic images of children as well as information that a given criminal does not want to have discovered. Computer forensics professionals can fight this by looking at the hash of the file and comparing it to the original image (if available.) While the image appears exactly the same, the hash changes as the data changes.[12
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