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2. Trusted timestamping - Wikipedia

   en.wikipedia.org/wiki/Trusted_timestamping

   The technique is based on digital signatures and hash functions. First a hash is calculated from the data. A hash is a sort of digital fingerprint of the original data: a string of bits that is practically impossible to duplicate with any other set of data. If the original data is changed then this will result in a completely different hash.

3. 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]

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

5. Trust service provider - Wikipedia

   en.wikipedia.org/wiki/Trust_service_provider

   The trust service provider has the responsibility to assure the integrity of electronic identification for signatories and services through strong mechanisms for authentication, electronic signatures and digital certificates. eIDAS defines the standards for how trust service providers are to perform their services of authentication and non-repudiation.

6. Electronic Signatures in Global and National Commerce Act

   en.wikipedia.org/wiki/Electronic_Signatures_in...

   The Electronic Signatures in Global and National Commerce Act (ESIGN, Pub. L. 106–229 (text), 114 Stat. 464, enacted June 30, 2000, 15 U.S.C. ch. 96) is a United States federal law, passed by the U.S. Congress to facilitate the use of electronic records and electronic signatures in interstate and foreign commerce.

7. Digital Signature Algorithm - Wikipedia

   en.wikipedia.org/wiki/Digital_Signature_Algorithm

   The Digital Signature Algorithm (DSA) is a public-key cryptosystem and Federal Information Processing Standard for digital signatures, based on the mathematical concept of modular exponentiation and the discrete logarithm problem. In a public-key cryptosystem, a pair of private and public keys are created: data encrypted with either key can ...