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2. Digital signature - Wikipedia

   en.wikipedia.org/wiki/Digital_signature

   The first widely marketed software package to offer digital signature was Lotus Notes 1.0, released in 1989, which used the RSA algorithm. [26] Other digital signature schemes were soon developed after RSA, the earliest being Lamport signatures, [27] Merkle signatures (also known as "Merkle trees" or simply "Hash trees"), [28] and Rabin ...

3. Electronic signature - Wikipedia

   en.wikipedia.org/wiki/Electronic_signature

   An electronic signature, or e-signature, is data that is logically associated with other data and which is used by the signatory to sign the associated data. [1] [2] [3] This type of signature has the same legal standing as a handwritten signature as long as it adheres to the requirements of the specific regulation under which it was created (e.g., eIDAS in the European Union, NIST-DSS in the ...

4. Code signing - Wikipedia

   en.wikipedia.org/wiki/Code_signing

   Many code signing systems will store the public key inside the signature. Some software frameworks and OSs that check the code's signature before executing will allow you to choose to trust that developer from that point on after the first run. An application developer can provide a similar system by including the public keys with the installer.

5. 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.

6. SignNow - Wikipedia

   en.wikipedia.org/wiki/SignNow

   The company's software-as-a-service platform is intended for individuals and businesses to sign, and manage documents from any computer. The e-signature product is also available for free on iPhone, iPad, and Android devices, which lets users upload and sign documents from their smartphone's e-mail, camera, or Dropbox account. [1]

7. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   As with Adobe Acrobat, Nitro PDF Pro's reader is free; but unlike Adobe's free reader, Nitro's free reader allows PDF creation (via a virtual printer driver, or by specifying a filename in the reader's interface, or by drag-'n-drop of a file to Nitro PDF Reader's Windows desktop icon); Ghostscript not needed.