Overview#
A digital forensics examiner clones a suspect's hard drive and records the SHA-256 hash of the forensic image. Six months later, at trial, defence counsel asks whether the file presented in court is identical to what was seized. Without cryptographic proof that the hash has not changed at any point in between, the answer is uncomfortable. With the Evidence Integrity Verification module, the answer is definitive: every verification event is recorded, every hash checked against the original, and the full chain of verification is available as a court-ready report at any time.
Integrity verification is not a one-time check at ingestion. Evidence can be accessed, copied, transferred, and processed many times before it reaches court. The module applies continuous monitoring across the evidence lifecycle, alerting immediately if any file's fixity check fails, and maintaining the complete verification history so examiners can demonstrate uninterrupted integrity from collection through presentation. This approach meets the standards required by criminal courts, digital forensics labs, financial regulators, and prosecutorial offices operating under strict admissibility requirements.
Mermaid diagram
stateDiagram-v2 [*] --> Ingested: Evidence Uploaded Ingested --> HashGenerated: SHA-256 / MD5 / SHA-3 Hash Computed HashGenerated --> DigitallySigned: Examiner Digital Signature Applied DigitallySigned --> Stored: AES-256-GCM Encrypted Storage Stored --> ContinuousMonitoring: Background Fixity Schedule Active ContinuousMonitoring --> VerificationPass: Hash Matches Original ContinuousMonitoring --> VerificationFail: Hash Mismatch Detected VerificationPass --> ContinuousMonitoring: Next Scheduled Check VerificationFail --> AlertRaised: Immediate Alert & Quarantine AlertRaised --> IncidentRecord: Tamper Event Logged Stored --> OnDemandVerification: Manual or Pre-submission Check OnDemandVerification --> IntegrityReport: Court-Ready Report Generated IntegrityReport --> [*]
Key Features#
- Multi-algorithm cryptographic verification supporting SHA-256, MD5, and SHA-3 for evidence authenticity, with algorithm selection configurable by jurisdiction or case requirement
- Continuous integrity monitoring applying scheduled fixity verification across stored evidence, with immediate alerts on any detected hash mismatch
- Digital signature support for non-repudiation of evidence handling events, linking specific examiners to verification actions
- Real-time on-demand verification with sub-second validation for individual items, suitable for pre-submission checks
- Batch verification for validating entire evidence collections before case preparation milestones or court submission deadlines
- Court-ready integrity reports with complete verification history, hash values, signing identities, and timestamps, formatted for PDF/A-3 archival export
- Digital Notary integration providing cryptographic tamper-evident timestamps on verification records
- Forensic soundness validation meeting legal admissibility standards across Irish courts and international jurisdictions
Use Cases#
- Verifying evidence integrity before court presentation to confirm that files are identical to what was originally collected and sealed
- Continuously monitoring evidence repositories for unauthorised modifications, with immediate quarantine and alert when anomalies are detected
- Generating court-ready integrity verification reports that document the complete fixity history of each evidence item
- Batch-validating evidence collections at key case preparation milestones to confirm all items remain unaltered
Integration#
The Evidence Integrity Verification module connects with evidence management, chain of custody, digital signature infrastructure, and compliance reporting systems.
Last Reviewed: 2026-02-23 Last Updated: 2026-04-14