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2. Digital signature - Wikipedia

   en.wikipedia.org/wiki/Digital_signature

   Download as PDF; Printable version; ... A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. A valid digital ...

3. List of file signatures - Wikipedia

   en.wikipedia.org/wiki/List_of_file_signatures

   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.

4. PAdES - Wikipedia

   en.wikipedia.org/wiki/PAdES

   The EU recognizes three different eIDAS-compliant implementations of advanced electronic signatures through digital signatures: PAdES, XAdES and CAdES. [7] An electronic signature can carry legal effect and be used as evidence in legal proceedings. A qualified electronic signature shall have the equivalent legal effect of a handwritten signature.

5. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   PDF files may be digitally signed, to provide secure authentication; complete details on implementing digital signatures in PDF are provided in ISO 32000-2. PDF files may also contain embedded DRM restrictions that provide further controls that limit copying, editing, or printing. These restrictions depend on the reader software to obey them ...

6. SignNow - Wikipedia

   en.wikipedia.org/wiki/SignNow

   SignNow was founded in 2011 by Chris Hawkins and Andrew Ellis, and operates in Newport Beach, California.The two saw an issue in signature and notary fraud, and set out to revolutionize use of e-signatures with a legally binding way to add signatures to electronic documents of all sorts with authenticity, non-repudiation, and data integrity. [4]

7. Adobe Sign - Wikipedia

   en.wikipedia.org/wiki/Adobe_Sign

   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.