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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 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]
In b-lt or b-LTV (the most complex) certificates remain valid for a very long term. PAdES allows certificates to be verified even after many decades at any time in the future, in spite of technological and other advances. If in the document itself the validar to confirm that the signature was valid is concept known as long-term validation (LTV ...
X.509 certificates are used in many Internet protocols, including TLS/SSL, which is the basis for HTTPS, [2] the secure protocol for browsing the web. They are also used in offline applications, like electronic signatures. [3] An X.509 certificate binds an identity to a public key using a digital signature.
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. [38]
%!PS-Adobe-3.0 ESPF-3.0: 0 eps epsf Encapsulated PostScript file version 3.0 [34] 25 21 50 53 2D 41 64 6F 62 65 2D 33 2E 31 20 45 50 53 46 2D 33 2E 30 %!PS-Adobe-3.1 ESPF-3.0: 0 eps epsf Encapsulated PostScript file version 3.1 [35] 49 54 53 46 03 00 00 00 60 00 00 00: ITSF␃␀␀␀`␀␀␀ 0 chm MS Windows HtmlHelp Data: 3F 5F?_ 0 hlp
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