How do you prove digital evidence was not altered in court?

You compute a cryptographic hash (such as SHA-256) of the evidence when it is collected and again at any later point. If the two hashes match, the file is bit-for-bit identical to what was seized; if even one byte changed, the hash changes completely. e-Dex records this hash before and after every custody handoff and prints an explicit MATCH or CHANGED verdict, so integrity is provable rather than merely asserted.

What is the difference between hash-before and hash-after?

The hash-before is the hash of the evidence as the custodian received it at the start of their step. The hash-after is the hash once their step is complete. When the two are equal, e-Dex prints 'Integrity across handoff: MATCH - evidence unchanged'; if they differ, it flags CHANGED so the discrepancy is investigated and explained rather than hidden.

Does e-Dex need an internet connection to verify evidence integrity?

No. e-Dex runs fully offline on your own Windows machine. Hashing, the hash-before / hash-after comparison and the append-only custody log all work without any network connection. An internet connection is only used if you choose to apply an optional RFC-3161 trusted timestamp from a Time-Stamping Authority.

How is the chain of custody made tamper-evident?

The custody log is append-only and hash-chained: each entry incorporates the hash of the entry before it, like links in a chain. Editing, deleting or reordering any entry breaks the chain and is immediately detectable. This turns the chain of custody from a list of names into a continuous, verifiable integrity record.

Prove Digital Evidence Not Altered: Hash-Before / Hash-After

Q: Is a hash-based integrity record admissible as evidence in India?

Admissibility is decided by the court on the facts of each matter and the applicable law, including Section 63 of the Bharatiya Sakshya Adhiniyam 2023 and the certificate requirements that succeed Section 65B of the Indian Evidence Act. e-Dex is a tool that helps you produce a clear, integrity-backed record to support such evidence; it does not by itself guarantee admissibility, and it is not a substitute for legal advice.

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P26-electronic-evidence-certificate.html" target="_blank" style="color:#3D61D2; text-decoration:underline;">Section 63 of the Bharatiya Sakshya Adhiniyam 2023 (the successor to Section 65B of the Indian Evidence Act), and the integrity of the record is routinely probed in cross-examination. A custody record that can show MATCH at each handoff — and a chained log that demonstrably has not been altered — gives the deponent something concrete to point to when tampering is alleged. It does not win the argument by itself, but it moves the conversation from "trust us" to "here is the proof," which is precisely where you want it.

A Note on Legal Advice

e-Dex helps you produce a clear, integrity-backed custody record; it is a tool, not a substitute for legal counsel and not a guarantee of admissibility. Whether and how such a record is accepted depends on the facts of your matter, who deposes, and the current text of the statute and any applicable rules. Always read the provision as it stands and take qualified advice where the stakes warrant it.

P26 and the certificate requirements that succeed Section 65B of the Indian Evidence Act. e-Dex is a tool that helps you produce a clear, integrity-backed record to support such evidence; it does not by itself guarantee admissibility, and it is not a substitute for legal advice. For more on the certificate itself, see our guide to the evidence integrity certificate.

Conclusion

Tampering challenges thrive on gaps. The way to close them is to make integrity visible at every step: record the hash as the evidence is received, record it again after each handoff, let the tool declare MATCH or CHANGED, and keep the whole log in a chained, append-only form that breaks if touched. That turns a fragile sign-out sheet into a continuous, provable record you can stand behind under cross-examination. Download e-Dex — the Digital Evidence Integrity Suite and build a chain of custody that proves, rather than promises, that your evidence was not altered.