What digital forensics involves
Digital forensics is not simply opening a device and searching for files. A defensible examination begins with lawful authority or consent, clear instructions, preservation of the original evidence, documentation of handling, and an examination plan linked to the questions that must be answered.
Preservation before analysis
The examiner records the item, its condition and relevant identifiers before acquisition. Where possible, a forensic copy is created and verified using cryptographic hash values. Analysis is then performed on a working copy rather than the original evidence.
From artefacts to findings
Digital systems create artefacts such as messages, call records, application databases, browser history, system logs, metadata and timestamps. These artefacts must be interpreted in context. A timestamp or deleted record may be significant, but it should not be treated as conclusive without considering the system, time settings, application behaviour and corroborating evidence.
What a forensic report should do
A sound report explains the instruction, items examined, methods used, relevant findings, limitations and the basis for each opinion. It should separate observed facts from interpretation and allow another suitably qualified examiner to understand the process followed.
When to obtain assistance
Early advice is valuable when evidence may be volatile, encrypted, remotely accessible or easily overwritten. Contact a forensic examiner before resetting a device, updating software, exporting only selected messages or allowing continued use.