Integrity (of data)

Integrity refers to the property ensuring that data has not been altered or falsified after its creation, transmission or storage. In digital signatures, integrity is guaranteed by the hash function: any modification to the document means the recalculated hash no longer matches the one encrypted in the signature, immediately invalidating the verification. This is why a PDF signed with Certyneo is 'sealed' — it can no longer be modified without the signature breaking.