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2. List of file signatures - Wikipedia

   en.wikipedia.org/wiki/List_of_file_signatures

   However, some file signatures can be recognizable when interpreted as text. In the table below, the column "ISO 8859-1" shows how the file signature appears when interpreted as text in the common ISO 8859-1 encoding, with unprintable characters represented as the control code abbreviation or symbol, or codepage 1252 character where available ...

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. Digital signature - Wikipedia

   en.wikipedia.org/wiki/Digital_signature

   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 ...

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   mail.aol.com

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6. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   PDF 2.0 defines 256-bit AES encryption as the standard for PDF 2.0 files. The PDF Reference also defines ways that third parties can define their own encryption systems for 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.

7. PAdES - Wikipedia

   en.wikipedia.org/wiki/PAdES

   PAdES (PDF Advanced Electronic Signatures) is a set of restrictions and extensions to PDF and ISO 32000-1 [1] making it suitable for advanced electronic signatures (AdES). This is published by ETSI as EN 319 142. [2]