Digital Signatures

Digital Signatures is the process that guarantees the contents of a message that have not been altered in transit. When the server digitally signs the document, you add a one-way encryption of the message content using the public and private key pair. Your client can still read but the process creates “signature” that only the server’s public key can break. The client, using the server’s public key can validate the sender as well as the integrity of message contents. Whether it’s an email, an online order, if the transmission arrives but the digital signature doesn’t match the public key in the digital certificate, then the client knows that message has been altered.

How does a Digital Signature Work?

Digital Signature can be considered as the numerical value i.e. represented as a sequence of characters. This creation is a complex mathematical process that can only be created by the computer.

How do I create a Digital Signature?

You can obtain a digital signature from the reputed certificate authority or you can create it yourself. You need a digital certificate to digitally sign the document. If you create and utilize a self-signed certificate, the recipients of the documents will not be able to verify the authenticity of the digital signatures. They will have to trust self-signed certificate.

If you want the recipients of the documents to be able to verify the authenticity of the digital signature. They will have to trust the self-signed certificate.

If you want the recipients of your documents to be able to verify the authenticity of your digital signature then you will must obtain a digital certificate from a reputable CA. After downloading and installing the certificate – you will able to utilize the “Sign” and “Encrypt” buttons on the mail content to encrypt and digitally sign emails which makes more sense in a business scenario, as it assures the recipient i.e. it was sent by you and not by some impersonator.

Types of Digital Signatures

ADOBE SUPPORTS

• Certified Signatures: - Adding a Certifying Signature to the PDF Document which indicates that you are the author of the document and want to secure the document against interfering. Certified PDF Documents displays the unique blue ribbon across the top of the document. It contains the name of the document signer and certificate issuer that indicates authorship and authenticity of the document.
• Approval Signatures: - It can be used in your organization’s business workflow that will help in optimizing your organization’s approval procedure. This process involves capturing approvals made by you and other individuals implanting them within the PDF document. Adobe allows the signatures to include details such as an image of your physical signature, date, location and the official seal.

MICROSOFT WORD SUPPORTS

• Visible Digital Signatures: -This will allow a single or multiple user to digitally sign a single document. This appear on the document in the same method as signatures are applied on the physical document.
• Invisible Digital Signatures: - Documents with the invisible digital signatures carries a visual indication of a blue ribbon in the task bar. You can utilize invisible digital signatures when you don’t want to display the signatures but you need to provide indications of the authenticity of the document, its integrity and origin.

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