IT4075 examines computer forensics as a discipline that supports law enforcement and corporate investigators in handling digital evidence with the rigor courts require. Students learn to use forensic tools and techniques to acquire, preserve, and analyze digital evidence while documenting every step in a way that survives legal scrutiny. The course covers white collar crime investigation, incident response and handling, and the legal issues that distinguish admissible evidence from evidence a defense attorney can have thrown out. IT4075 treats forensics as equal parts technical skill and procedural discipline.
Forensic tools and techniques: matching method to evidence type
| Technique | Evidence Type | Primary Tool Examples | Key Requirement |
|---|---|---|---|
| Disk imaging | Hard drives, SSDs, removable media | FTK Imager, dd, EnCase | Bit-for-bit copy with write-blocking hardware to preserve the original |
| Memory forensics | Volatile RAM contents, running processes | Volatility Framework, Magnet RAM Capture | Capture before shutdown, since volatile data is lost on power-off |
| Network forensics | Packet captures, firewall and IDS logs | Wireshark, NetworkMiner, SIEM platforms | Timestamp synchronization across devices for accurate event reconstruction |
| Mobile device forensics | Smartphones, tablets, SIM cards | Cellebrite UFED, Oxygen Forensic Detective | Handling device lock states and encryption without altering evidence |
| File system analysis | Deleted files, metadata, file system artifacts | Autopsy, The Sleuth Kit | Recovering data from unallocated space without modifying the source media |
Chain of custody: the procedural backbone of admissible evidence
IT4075 treats chain of custody as the single most important procedural concept in the entire course, because a forensic finding is worthless in court if its handling cannot be documented from collection to presentation. Chain of custody requires a continuous, documented record of who collected each piece of evidence, when, how it was transported and stored, and who accessed it at every subsequent step. Students learn to use cryptographic hash values (MD5, SHA-256) computed at the moment of acquisition and verified at every later stage to prove that evidence was not altered. A mismatched hash value at any point in the chain raises reasonable doubt about evidence integrity, potentially making it inadmissible regardless of what it shows. The course requires students to practice writing chain-of-custody documentation that would satisfy the Federal Rules of Evidence, including Rule 901 on authentication, and to understand how the exclusionary rule can eliminate critical evidence when procedure breaks down.
Beyond chain of custody, IT4075 covers the broader forensic methodology that governs an investigation from initial response through final reporting. The order of operations matters: first responders must avoid altering volatile evidence (such as running processes or open network connections) before a forensic specialist arrives, since improper handling at this stage can permanently destroy evidence. Students study the distinction between live forensics (analyzing a running system, necessary for capturing volatile memory) and dead-box forensics (analyzing a powered-down, imaged drive, which provides a more stable and repeatable analysis environment). The course also addresses incident response integration, since computer forensics frequently begins as part of a security incident: a forensic investigator must coordinate with the incident response team to ensure evidence preservation does not conflict with containment and eradication needs. Legal issues run throughout, including search and seizure requirements under the Fourth Amendment, the Electronic Communications Privacy Act's standards for accessing stored communications, and the qualifications an expert witness must establish before forensic testimony is accepted in court.
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Key topics in IT4075
- Digital evidence acquisition: disk imaging, write-blocking, hash verification (MD5, SHA-256), live vs. dead-box forensics methodology
- Chain of custody: documentation standards, evidence tagging and storage, transfer logs, and the legal consequences of broken custody chains
- Memory and volatile data forensics: capturing RAM contents, analyzing running processes, network connections, and registry artifacts before shutdown
- File system forensics: recovering deleted files, analyzing file metadata and timestamps, examining unallocated space and slack space for hidden data
- Network forensics: packet capture analysis, log correlation across firewalls and IDS, timeline reconstruction of network-based incidents
- Mobile device forensics: extraction methods for smartphones and tablets, handling encryption and device locks, app data and cloud-synced evidence
- Incident response integration: coordinating evidence preservation with containment and eradication, first-responder procedures that avoid evidence spoliation
- Legal and ethical issues: Fourth Amendment search and seizure standards, Electronic Communications Privacy Act, expert witness qualification, courtroom presentation of technical findings
The forensic investigation process IT4075 students must document accurately
- Identification: recognizing that an incident has occurred and that digital evidence exists, determining scope and which systems require preservation
- Preservation: imaging drives with write-blockers, capturing volatile memory before shutdown, and computing hash values immediately to establish an evidentiary baseline
- Collection: gathering evidence according to a documented plan, labeling and logging every item, and maintaining the unbroken chain of custody from this point forward
- Examination and analysis: using validated forensic tools to recover, filter, and interpret evidence, always working from a verified copy rather than the original media
- Reporting and presentation: documenting findings in a clear, reproducible report and, when required, presenting technical conclusions as expert testimony in a manner a non-technical judge or jury can understand
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Forensic investigation reports, chain of custody documentation, incident response case studies, evidence analysis assignments. Computer forensics coursework grounded in procedural and legal rigor.
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Frequently asked questions
Chain of custody establishes a continuous, documented record proving that evidence was handled properly from the moment of collection through its presentation in court, with no opportunity for tampering or contamination. Courts will exclude evidence, no matter how technically compelling, if the prosecution or investigating party cannot account for every person who handled it and every location it occupied. IT4075 requires students to practice documenting custody transfers because a single unexplained gap, such as evidence sitting in an unlocked office overnight without a logged custodian, gives defense attorneys grounds to argue the evidence may have been altered. Hash verification reinforces this: computing a cryptographic hash at collection and re-verifying it at each subsequent examination proves mathematically that the data examined is identical to the data originally seized, closing the gap that procedural documentation alone cannot fully address.
Live forensics involves examining a system while it remains powered on and running, which is necessary to capture volatile data such as RAM contents, active network connections, and running processes that disappear the moment the system shuts down. The tradeoff is that any interaction with a live system risks altering evidence, since simply running a command can change file access timestamps or overwrite memory. Dead-box forensics, by contrast, involves powering down the system, removing the storage media, and creating a forensic image using write-blocking hardware that physically prevents any write operation to the original drive. This produces a stable, repeatable environment for analysis but sacrifices volatile data entirely. IT4075 teaches students to make this judgment call based on the situation: if volatile evidence such as an active malware process is critical to the investigation, live forensics techniques must be used first, carefully and minimally, before transitioning to dead-box analysis of the imaged drive.
Incident response prioritizes containing an active threat, eradicating it, and restoring normal operations as quickly as safely possible. Computer forensics prioritizes preserving evidence in a legally defensible form, even when that conflicts with the fastest path to recovery. These goals can clash: an incident responder may want to immediately wipe and rebuild a compromised server, while a forensic investigator needs to image that same server first to preserve evidence for potential prosecution or civil litigation. IT4075 teaches students to recognize this tension and to build coordinated procedures where the two functions support rather than undermine each other, typically by establishing in advance which incidents trigger a forensic hold before any remediation begins. Organizations that fail to plan this coordination often destroy the only evidence that could identify how an attacker got in or attribute the attack to a specific actor.
Digital evidence must satisfy the same foundational rules that govern all evidence, primarily relevance, authenticity, and reliability, but applying these rules to digital data raises unique challenges. The Federal Rules of Evidence, particularly Rule 901, require that evidence be authenticated, meaning the proponent must show the evidence is what they claim it is, which in forensics is established through chain of custody documentation and hash verification rather than eyewitness testimony. The Fourth Amendment governs how evidence may initially be collected, requiring a valid warrant or an applicable exception (consent, plain view, exigent circumstances) before law enforcement can search digital devices. The Electronic Communications Privacy Act adds another layer of protection for stored communications such as email and cloud-stored files, requiring specific legal process before providers must disclose content. IT4075 requires students to analyze case scenarios against these standards, since a forensic finding obtained through an illegal search can be suppressed entirely under the exclusionary rule, regardless of its technical accuracy.