![]() ![]() There is also no requirement for page-level control in the ISO 9000 system. With an electronic document, such as this one, there is no need for old-fashioned page-level revision control. Typed names and graphic images cannot do either – and neither can ink on paper. A digital signature, then, proves that neither the signature or the document is forged or altered. Second, it authenticates the document, since if any part of the document has been changed since it was signed, the verification will fail. First, it authenticates the person who signed the document, since only that person has the private key. The signature can be verified by anyone who has the signer's public key. In use as a signature, a document is “signed” using the signers private key. A digital signature created using this method has two parts: a “private” key known only to the user, and a “public” key available to the world. Alternative names are public-key cryptography or RSA encryption (which is defined in the QM). ![]() A true digital signature, using a computer method called public-key encryption, is a code that becomes invisibly embedded in the document. ![]() A digital signature is not a typed version of the person's name, nor is it an image of a person's signature. The example manual does not actually have a digital signature, but one could easily be applied. On the cover page of the QM you will see a reference to a digital signature. ![]()
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