Meaning
A computational method used to confirm that a digital file has remained unchanged by comparing its unique mathematical signature. Through hash verification, an auditor checks the integrity of a stored document against a previous state. It governs the detection of tampering or corruption.
The method stops working if the original hash value was not recorded at the time of creation.
Integrity Check
Algorithmic functions produce a string of characters representing the data. Use of hash verification provides a way to see if a backup matches the source. It is the primary tool for ensuring that an archive has not been modified.
Procedural Steps
The process begins with running a file through a standard algorithm like SHA-256. The resulting value is then compared to a known good value stored in a secure log. If even one bit of the file has changed, the hashes will not match.
This provides a binary result that leaves no room for interpretation. It is a mathematical proof of sameness. The founder relies on this proof when the validity of a record is questioned.
By maintaining a list of original hashes, a company can prove its archives are pristine.
Foundational Proof
Confirming the identity of a file is the first step in any audit. This mechanism protects the record from silent degradation over years of storage. It stands as the floor of digital trust.
