Vsign lỗi the document has not been modified this signature năm 2024

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Hi, we are using a remote webservice to digitally sign some PDF documents we generate. They actually get signed twice, the first time with our own certificate (will be a QESeal in production). The second time they will be signed by our client using their own european qualified signature. Both our software and the clients' one use the iText library to do the signing (both v7.1.18).

While testing this flow we discovered that Adobe Reader v2023.001.20093 marks our signature as invalid when the client applies a visible signature. However a binary diff of the files shows that the additional signature is appended and doesn't modify at all the initial file (see the attached screenshot).

This does not happen if the client signs with an invisible signature.

Why does Acrobat shows that the document has been modified when applying a visible signature?

Thanks in advance,

Luca

After signing a PDF file and then opening it in Adobe Reader or Adobe Acrobat the following message may be shown just below the toolbar:

At least one signature has problems

This message does not indicate that the digital signature is invalid or corrupt. Instead it’s a poorly worded message from Adobe that causes unnecessary alarm. If you click on the Signatures panel on the left hand side of Adobe Reader or Adobe Acrobat you will see additional information about this message. Expand the “Signature validity is unknown” field and you’ll see a far more descriptive explanation of the issue.

Signer’s identity is unknown

Digital signatures that were added using what’s called a “self-signed certificate” — usually a certificate that you have generated yourself using a third party application — cannot be automatically validated by Adobe because the certificate is not in the list of Trusted Identities that Adobe uses to validate signatures.

It’s important to note that this message is not saying that your digital signature is invalid and it’s not saying that the PDF has been modified since it was signed (see the text in the screenshot above: “Document has not been modified since this signature was applied”), it’s just saying that Adobe wasn’t automatically able to validate the certificate. You also won’t be able to manually validate the signature until the certificate is trusted by Adobe.

To resolve this issue you need to make Adobe trust the certificate that was used to sign the PDF. Warning: only do this if YOU trust the certificate. Don’t do it for any random certificate as this can be a security issue and is not actually required if you just want to view the PDF.

You can add the certificate that was used to apply the digital signature into Adobe’s list of Trusted Identities by following these steps:

I understand the validation attribute, but the average person doesn't know about that, and the companies/contractor only want their work to be completed and delivered. In my case, this should mean that, when a project is under construction, designs MUST be checked with the signed documents in our files...; fortunately some of us save copies in PREPA's servers and also require a physical copy to compare and use in the field.

An electronic digital signature indicates data in electronic form which is legally linked or attached with other data in electronic form. Electronic Digital Signatures are used by the signatory for the purpose of signing a document. An Electronic Signature is equivalent to a handwritten signature digitized and is used to confirm content within a document or the terms of a specific document.

eSign is a digital form of signature service that can be incorporated with the service delivery applications with the help of an API to facilitate an eSign user to sign the document electronically. The eSign authentication can be done through e-KYC service and further paperless electronic signature can be enabled. With the eSign services, it is easier to share files digitally and track the status via follow-ups on email. Through the electronic system, nobody has to wait to get the documents signed and the process becomes swift and hassle-free.

Yes, digitally signed documents are just as legally valid as signatures on a paper document, and it's essential that every signer is aware of the legal effect of signing a document online. Documents signed online are legally bound.

Digitally signed documents are just as legally valid as signatures on a paper document, and it's essential that every signer is aware of the legal effect of signing a document online. Documents signed online are legally bound.

Some years back, the traditional form of signatures was enjoyed; however, the situation at present is changing. Different countries have passed a law to certify the validity of electronic signatures; India has been keeping up a good hold with the technology and industry standards in the digitized world. Recently, the Reserve Bank of India has allowed finance banks to use electronic signatures for financial transactions. It has become a tradition nowadays for banks to adopt electronic signatures. Now that the digital signature certificate has become the most widely used form of electronic signature, it is foreseen in the years to come that electronic signatures will be made mandatory for every payment bank and financial bank.

Open the file that comprises the digital signature you want to view. Click the Signature Details listed there. From the Signature Details dialog box, it is easy to determine if the signature is:

• Valid: The signature is current. The certificate is reliable and isn’t expired or canceled.
• Invalid: The certificate is revoked or the content signed has been changed.
• Recoverable error: The signature isn’t valid now but it can be recovered. The issue could be that you are offline, the certificate is expired, or the certificate issuer isn’t reliable.
• Partial signature: A part of a file is signed.

A digital signature certificate is an electronic form of a signature that can be used to validate the identity of the signer. It ensures that the original content of the message or document has remained intact during transit. Paperless Digital Signature is easily transportable and cannot be imitated by someone else. The paperless digital signature can be issued by authenticating an individual via Aadhaar eKYC. Any individual whose Aadhaar Card is linked with the mobile number can procure paperless digital signatures.

Paperless DSC uses an encryption system for the transformation and protection of data transmissions. Information encryption takes place using at the sending site with a public key and decryption takes place at the receiving site with a private key. An optional timestamp recognizes the day and time of issue, ensuring the validity of the digital signature, even if the certificate gets expired.

There are three easy steps involved to apply for a Paperless Digital Signature Certificate:

1. Fill the Digital Signature Certificate application specifying the User Type, Certificate class, etc.
2. Submit the relevant documents as required and make the payment for the application.
3. Post successful verification of documents, the applicant can download the certificate using the credentials provided to him via email.

When timestamping isn’t offered by the certificate authority, all digital signatures made using the certificate become invalid after the certificate expiration date. All the digital certificates have an expiration date. Renewal of Digital certificate and issuance of new keys help prevent decipher key combinations and theft of private information. Approximately 90 days before the expiration date, the certificate holder gets notice of expiration, information on renewal, and receiving a new encryption key. If the certificate doesn’t get renewed within this time frame, the certificate expires, and a warning message is received by visitors to the website.

The validity period of a digital signature certificate is 1 or 2 years from the date of its download into a token. Subscribers must be well aware of their certificate validity so that they can renew their certificate on time before the validity of the certificate expires. Also, the expired certificate could lead to business loss; to avoid risks of loss, subscribers should know the validity of their digital signature certificate.

An individual should obtain a DSC-USB token in case of DSC renewal. If an individual has not procured a USB-token while registering for his DSC, then he should procure the same for the renewal process. The renewal of DSC should be applied with the same name registered in the existing DSC. No change during the renewal process is permitted and is considered as a new application for DSC. Changes made to the postal address and contact details are allowed. It is wise to make the renewal application of the DSC 7 days prior to the expiry of the existing DSC.