In this article, I explore the generic process for digitally signing a document using Acrobat X and what you can expect.
Please know going into this article that I am not going to cover in-depth options such as Certificate Authorities or using Adobe Certified Document Services.
There is a lot of great information out there related to more “advanced” methods of signing and certifying signatures.
Validating digital signature
The simplest way is to make them locally, and then apply to the CA for a certificate, submitting the public key data.
In other cases, keys may be made centrally and distributed by secure channels to the key holders.
I am not able to understand that how the digital signature is verified.
I know that digital signature will be attached to the message and sent by sender to receiver.
If the two are the same, he knows that the message was not tampered with, because only the sender has the private key, and there is no reasonable way to determine the private key from the public key. That's the Certificate Authority's job (CA for short).