A digital signature is a mathematical technique used to validate the authenticity and integrity of a message, software or digital document. As the digital equivalent of a handwritten signature or stamped seal, a digital signature offers far more inherent security, and it is intended to solve the problem of tampering and impersonation in digital communications.
Digital signatures can provide the added assurances of evidence of origin, identity, and status of an electronic document, transaction or message and can acknowledge informed consent by the signer.
Digital signatures are based on public-key cryptography, also known as asymmetric cryptography. Using a public key algorithm, such as RSA, one can generate two keys that are mathematically linked: one private and one public.
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