Digital Forensics

Computer Forensics, also known as Digital Forensics, is a scientific examination by a certified computer forensic specialist, which includes the identification, collection, preservation, and analysis of all forms of Electronically Stored Information (ESI). What is CoC (Chain of Custody) and why is it important for evidence integrity? What are the common situations in which forensics are used? How a forensic investigation is typically approached? Are there any actions that should be avoided during an investigation? Please explain.