What is Data Analysis? Proper Methods in Digital Evidence
Data analysis is the systematic process of transforming raw data into meaningful information that becomes evidence and decisions. In digital evidence analysis and forensic informatics practice, this process is not just about producing visualizations. Legal compliance, integrity, verifiability and causal link (data-person-act relationship) are essential.
In the digital age, data analysis is at the heart of every investigation. However, not every piece of “data” is information or evidence. Misinterpreted or unverified records can lead to erroneous arrests, victimization, and wasted years. As DNA Criminal & Forensic Informatics, our goal is to transform raw data into meaningful information and ensure that this information has the quality of legally usable evidence. Therefore:
Technical verification: Internal consistency and external consistency checks of records are performed.
Causal link: The connection between data-suspect-alleged act is substantiated.
Legal framework: CMK 134-135 is ensured with legislation, especially Full compliance.
Chain verification: Cross-checking is done with operator data, system logs, device images, and independent sources.
Data – Information – Evidence
Data: Raw records (file lists, logs, HTS records, device images).
Information: Data verified with internal/external sources, given context.
Evidence: Information that is legally obtained, hash value and timestamp with integrity verified, with established causal link to the crime.
Rule: For evidence quality, 5W1H, chain of custody, hash value, and timestamp steps must be complete.
What is Data Analysis?
Data Analysis Stages in Criminal and Forensic Informatics
Scope & Hypothesis: Event questions, tool set, time window.
Acquisition: Seizure in compliance with CMK and relevant legislation; imaging; MD5/SHA-256 hash generation.
Integrity Verification: Image-original hash equality check.
Enrichment: Metadata, log correlation, base/signal, device time difference, timeline creation.
Internal Consistency: Time sequences in the same system, MFT/journal, application logs compatibility.
External Consistency: Intersection/verification with operator records, OSINT, and physical findings.
Analysis & Test: Alternative hypotheses; measurement of false-positive risks.
Reporting: Clear methodology, tool versions, hashes, limitations, and visuals.
This structure provides topic authority by signaling to search engines that the subject matter is fully covered.
Why are Internal Consistency and External Consistency Critical?
Internal consistency: Do timestamps, sequential record order, log chain align with each other?
External consistency: Has the same event left the same traces in another system?
Example: If a search appears through HTS analysis, are GSM/base data, landline and physical findings also consistent?
Without consistency, data does not become evidence; at most, it’s considered a clue.
Digital Media (SD Card, HDD, Phone)
Chain of custody (CoC): Who acquired—who delivered—on what date—where stored: complete record.
Image & Hash: Write-protected image from original; hash value must be clearly stated in the report.
File system examination: Scanning for traces of subsequent addition/tampering with MFT/journal, timeline, browser/registry/SQLite artifacts.
Device-content compatibility: model-production-version information and content Date consistency between card/device.
“Red Flags” in HTS/Payphone Analyses
HTS/payphone calls carry metadata (who, whom, when, how long), not content. Therefore, these anomalies are important:
Overlapping times: Two simultaneous calls appearing on the same landline/payphone.
Technical impossibility: Extremely short transition time (e.g., under 20 sec) between two calls.
Human impossibility: Sequence falling below realistic dialing time in coded/encrypted phonebook.
Duplicate record: The same call appearing duplicated in the database.
Hierarchy mismatch: Lists inconsistent with rank/term sequence claimed in organizational model.
VOIP/fake caller: Multi-user calls from a single 0850/VOIP number or possibility of caller ID spoofing.
Note: These flags don’t necessarily mean “definitely fake”; they indicate the need for additional examination. Techniques like war dialing and spoofing can produce false positives; cross-verification is always necessary.
Legal Compliance and Causal Link
Regulatory compliance: CMK 134/135 and constitutional guarantees; clarity of person-line-duration-crime in decision texts.
Causal link: Data must be defendant linked to the criminal element, and the defendant to the clearly.
Defense rights: Raw data sharing, independent expert access, methodological transparency.
Evidential value: Content-free contact and single-source data are supporting evidence; not sufficient alone for conviction.
FAQ – Data Analysis and Digital Evidence Analysis
1) Is data analysis alone sufficient for conviction?
No. Especially content-free HTS contact or raw lists are not sufficient alone; concrete action/organizational connection is required.
2) Why is the hash value essential?
It proves that the image has not changed; provides integrity assurance in court.
3) Is “sequential search” automatically organizational?
No. Techniques like war dialing and spoofing can produce false positives; HTS analysis must be verified with external consistency and other sources.
Conclusion: Evidence Requires Meticulousness
In DNA Criminal and forensic informatics processes, data analysis is a discipline where technical verification and legal safeguards operate simultaneously. When internal/external consistency, hash/timestamp, causal link, and defense rights are meticulously observed, raw data transforms into real evidence.
DNA Criminal & Forensic Informatics – how We Work
With DNA Criminal meticulousness and Forensic Informatics Consultancy methodology:
Preliminary Assessment: Case targets and hypotheses, legal boundaries.
Evidence Collection/Imaging: Procedurally correct process with hash and documentation.
Multiple Verification: Correlation of operator-log-device-network-external source.
Risk Analysis: Probability tests for war dialing/VOIP/spoofing/malware.
Legal Compliance Check: CMK/ECHR filters.
Reporting: Technical findings + legal interpretation, visualization, and appendices.
Hearing Support: Expert opinion/consultation, cross-examination preparation.
Result: Judicial authorities receive a report that is understandable, testable, and convincing.
Contact
Do you have a case? Contact us for independent expert analysis and a solid report.
For technical support, forensic reporting, and professional defense;
0552 676 11 00