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He uses Alice's public key to verify the authenticity of the signed message. A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. A valid digital signature on a message gives a recipient confidence that the message came from a sender known to the recipient. [1] [2]
Adobe Acrobat Sign (formerly EchoSign, eSign & Adobe Sign) is a cloud-based e-signature service that allows the user to send, sign, track, and manage signature processes using a browser or mobile device. [4] It is part of the Adobe Document Cloud suite of services.
A file signature is data used to identify or verify the content of a file. Such signatures are also known as magic numbers or magic bytes. Many file formats are not intended to be read as text. If such a file is accidentally viewed as a text file, its contents will be unintelligible.
The digital signature provides message authentication (the receiver can verify the origin of the message), integrity (the receiver can verify that the message has not been modified since it was signed) and non-repudiation (the sender cannot falsely claim that they have not signed the message).
For example, Adobe Systems grants permissions to enable additional features in Adobe Reader, using public-key cryptography. Adobe Reader verifies that the signature uses a certificate from an Adobe-authorized certificate authority. Any PDF application can use this same mechanism for its own purposes. [37]
Common values include digital signature validation, key encipherment, and certificate signing. Extended Key Usage : The applications in which the certificate may be used. Common values include TLS server authentication, email protection, and code signing.