Secure digital signatures require verified subscriber uniqueness, identification, exclusive control, and alteration-sensitive linkage to electronic records.

Secure digital signature status depends on an agreed security procedure verifying, at the time of affixation, that the signature is unique to and identifies the subscriber, is created using means under the subscriber's exclusive control, and is linked to the electronic record so that alteration invalidates it. Where these cumulative conditions are satisfied, the signature is deemed a secure digital signature.

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