InformationalSeptember 19, 2023Digital Forensics 101

Digital Forensics, also known as cyber forensics, is a field within forensics focused on systematically collecting, examining, and analyzing digital information and electronic devices for legal proceedings. It applies forensic techniques to digital artifacts and data, including devices like hard drives and mobile devices. The need for digital forensics emerged in the 1990s due to computer-related crimes, leading to the establishment of specialized units by agencies like CID and FBI. Commercial tools like EnCase and FTK were developed, enabling live forensics without altering original data. Adherence to legal regulations is crucial in digital forensics investigations.  

Branches of Digital Forensics

Digital Forensics comprises several branches, each focusing on specific aspects of digital evidence: 

  1. Computer Forensics: This branch deals with the investigation of data stored on computers, including hard drives, memory, and other storage devices. 
  1. Mobile Device and PDA Forensics: Mobile devices like smartphones and tablets often contain valuable digital evidence, and this branch focuses on extracting and analyzing data from such devices. 
  1. Network Forensics: Network forensics involves monitoring and analyzing network traffic to identify and investigate security incidents and data breaches. 
  1. Forensic Data Analysis: This branch is concerned with the in-depth analysis of digital data to uncover patterns, anomalies, and insights that can aid in investigations. 
  1. Database Forensics: Database forensics focuses on examining databases and database systems to uncover evidence related to data tampering, unauthorized access, or data breaches. 
  1. Cloud Forensics: With the increasing use of cloud services, this branch deals with the investigation of data stored in cloud environments, including identifying access logs and evidence related to cloud-based activities. 

Types of Digital Forensics 

As digital data forensics continues to advance, it gives rise to various sub-disciplines, some of which are detailed below: 

1) Computer Forensics 

It helps in analyzing digital evidence obtained from laptops, computers, and storage media in order to support ongoing investigations as well as legal proceedings. 

2) Mobile Device Forensics 

This involves the acquisition of evidence from compact electronic devices like personal digital assistants, smartphones, tablets, SIM cards, and gaming consoles. 

3) Network Forensics 

Network or cyber forensics relies on data acquired through the monitoring and analysis of cyber network activities, encompassing incidents such as attacks, breaches, or system failures resulting from malicious software and unusual network traffic. 

4) Digital Image Forensics 

This specialized field centers on extracting and examining digital images to confirm their authenticity, scrutinize metadata, and uncover their history, including contextual information. 

5) Digital Video/Audio Forensics 

This field examines audio-visual evidence in order to determine its authenticity or any additional information, such as location and time intervals. 

6) Memory Forensics 

It pertains to the retrieval of data from the active memory (RAM) of a computer that is currently in operation and is alternatively termed “live acquisition.” 

Phases of Digital Forensics 

The below mentioned are the phases of digital forensics: 

1) Initial Response 

Phase one, known as the Initial Response, encompasses the immediate actions taken in response to a security incident, with the specific response tailored to the incident’s nature. 

2) Seizure and Search 

In the second phase, the professionals look for the devices used in the crime. These devices are then carefully examined and seized to extract information. 

3) Gather Evidence 

During this phase, the professionals gather data by utilizing the acquired devices. They possess clearly defined forensic techniques for managing evidence. 

4) Protect the Evidence 

In this phase, the forensic team should be able to access a secure location where they can store the evidence. They determine whether the gathered information is correct, authentic, and accessible. 

5) Data Collection 

Data acquisition involves the retrieval of Electronically Stored Information (ESI) from suspected digital assets. It helps in gaining insights into the incident. However, an improper process can alter the data, jeopardizing the evidence’s integrity. 

6) Data Analysis  

Following the data collection phase, the responsible personnel perform a scan of the gathered data with the goal of pinpointing evidential information suitable for presentation in court during the data analysis stage. This phase entails the examination, identification, segregation, conversion, and modeling of data to transform it into valuable, actionable information. 

7) Evidence Evaluation 

The process of evidence assessment establishes a link between the evidential data and the security incident. Depending on the case’s extent, a comprehensive assessment should be conducted. 

8) Reporting and Documentation 

This phase occurs after the investigation and encompasses the reporting and documentation of all discoveries. Furthermore, the report must include substantial and legally acceptable evidence for use in a court of law. 

9) Testify as an Expert Witness 

In this phase, forensic investigators should approach the expert witness in order to confirm the accuracy of the evidence. An expert witness is a professional who investigates a crime to gather evidence. 

Digital forensics is a critical field that aims to ensure that justice is served and cybersecurity threats are mitigated. From computer forensics to mobile device forensics and network forensics, it encompasses a wide range of disciplines aimed at uncovering digital evidence.

As technology continues to evolve, the need for skilled digital forensic professionals is only going to increase. The phases of digital forensics, from initial response to testifying as an expert witness, provide a structured framework for conducting investigations that can stand up in a court of law.

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Aaditya Deshmukh

by Aaditya Deshmukh

Security Consultant | Redfox Security