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2026-09-20 13:05 #forensics #digital forensics #incident response #security #principles

The 5 Principles of Digital Forensics

Lawfulness
All evidence must be collected legally and ethically. Unauthorized access or unlawful searches can render evidence inadmissible in court and violate privacy laws.
Reproducibility
An independent examiner should be able to reproduce the same results given the same evidence and tools. This means every step must be documented thoroughly so the findings are verifiable and reliable.
Defensibility
The investigation process must be sound and defensible in court. Every action, tool used, and conclusion must be documented so it can withstand cross-examination and legal scrutiny.
Integrity
The original evidence must remain unchanged. Investigators typically work on forensic copies or write-protected images, using cryptographic hashes (like MD5 or SHA-256) to prove that the evidence was not altered.
Objectivity
The investigator must remain unbiased. Personal theories should not drive the investigation; the evidence should lead to the conclusions, not the other way around.

These principles apply to investigations involving malware, data breaches, insider threats, and incident response. They are closely related to concepts like chain of custody and evidence preservation.