Abstract: Crime is an illegal activity that is punished by the government, evidence is required to prove the crime. The evidence gained from a crime place is crucial because it serves as proof of the offense. The digitization of evidence is an urgent necessity. In the digital era, the management and integrity of crime evidence present substantial challenges due to risks of tampering and loss of data integrity. Throughout the investigation process, and the integrity of sensitive data must be maintained as it passes through the various levels of intermediaries that form the Chain of Evidence (CoE).
The evidence needs to be tamper-proof and protected against any alterations. To build robust systems with immutability, integrity, and legitimacy, SHA & AWS S3 is superior. Using SHA & AWS S3 service, digital evidence can be transferred between parties without a central authority in a transparent manner. We focused on how SHA algorithm & AWS S3 based solutions can help in building a strong secure system. The system is implemented using SHA algorithm platform to achieve integrity, immutability transparency as well as tampering can be identified.

Keywords: : Digital Evidence, SHA algorithm, AWS S3, Chain of Evidence, Integrity check

| DOI: 10.17148/IARJSET.2025.125361