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2. 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 confidence that the message came from a sender known to the recipient. [1] [2]

3. PAdES - Wikipedia

   en.wikipedia.org/wiki/PAdES

   PAdES has 4 levels of verification for digital certificate, from the most simple and basic (b-b, indicating a signature was executed with a certificate that was valid on a date) to the most complex (b-LTV) allowing electronically signed documents to remain valid for long periods (long term validity) even if underlying cryptographic algorithms ...

4. Digital Signature Algorithm - Wikipedia

   en.wikipedia.org/wiki/Digital_Signature_Algorithm

   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).

5. Digital Signature Standard - Wikipedia

   en.wikipedia.org/wiki/Digital_Signature_Standard

   It defines the Digital Signature Algorithm, contains a definition of RSA signatures based on the definitions contained within PKCS #1 version 2.1 and in American National Standard X9.31 with some additional requirements, and contains a definition of the Elliptic Curve Digital Signature Algorithm based on the definition provided by American ...

6. Public key certificate - Wikipedia

   en.wikipedia.org/wiki/Public_key_certificate

   Key Usage: The valid cryptographic uses of the certificate's public key. 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.

7. 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 ...

8. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

9. Message authentication - Wikipedia

   en.wikipedia.org/wiki/Message_authentication

   Message authentication is typically achieved by using message authentication codes (MACs), authenticated encryption (AE), or digital signatures. [2] The message authentication code, also known as digital authenticator, is used as an integrity check based on a secret key shared by two parties to authenticate information transmitted between them. [4]