D3 Mobile Forensics
From a record to a defensible finding.
Wholly synthetic teaching example. No client, device, real message or completed laboratory test is represented. This is not a prediction of recoverability.
The question
In this invented example, a supplied image displays a message reading “Meeting moved to 14:00”. The question is whether the supplied records support that wording and whether they identify the human author. The evidence described below is hypothetical.
Keep the evidential steps separate
| Step | Illustrative record or conclusion |
|---|---|
| Source and scope | A supplied screenshot and a separately supplied extraction purport to cover the relevant account and date. Their acquisition notes, scope, identifiers and omissions must first be assessed. |
| Observation | Assume an examiner validates a database row containing the displayed wording, an account identifier and a timestamp field. Record its precise source reference and validated field meaning. |
| Supported finding | The examined row is consistent with the displayed wording in this supplied representation. State which elements correspond and which could not be checked. |
| Inference boundary | Correspondence supports consistency between these sources. It does not alone establish that the screenshot was independently created, that the dataset is complete or that a particular person typed the message. |
| Alternative explanations | Shared account access, linked endpoints, export selection, synchronisation or earlier editing may matter. Test relevant alternatives rather than assuming the device owner was the author. |
| Further corroboration | Where proportionate and authorised, compare counterpart records, account/session activity, adjacent messages and source-device artefacts. Normalise time zones and distinguish creation, receipt and export times. |
| Express limitations | If the original device, acquisition method or relevant time period is unavailable, say so. A hash of the supplied file establishes a comparison baseline, not the truth of its contents or its earlier history. |
What a bounded conclusion looks like
In this hypothetical example, the validated row and supplied image are consistent as to the displayed wording. Human authorship, original source completeness and the earlier history of the supplied material remain unresolved on these materials alone.
Actual conclusions depend on the material examined, validated interpretation and the instructed questions. Material limitations and adverse findings are disclosed, whatever the agreed reporting format.
Evidence quality and confidence · Independent review · Inference explained
Sources and interpretation
Each entry identifies its limited supporting proposition and documentation-check date. General methodology is not a current device-support list. These checks are not laboratory validation; availability and method suitability require assessment for the exact source and configuration.
- NIST mobile device forensics guidance
Methodological background (2014), not a current device-support list.
General methodology · Documentation checked
Confidential case review
