PKI
PKI (Public Key Infrastructure) enables users of an insecure public networks, such as the Internet, to securely and privately exchange data and money through the use of a public and a private cryptographic keys which are obtained and shared through a trusted authority. These two keys have a unique mathematical relationship to one another. The public key is distributed publicly, while the private key is kept secret/safe/secure.
A digital signature is created with a private key to prove/track the authenticity of various e-transactions. It enables realization of the basic requirement of every financial transaction – non-repudiation.
A digital certificate is an electronic document that establishes user credentials when doing business or other transactions on the Web. It is issued by a certification authority (CA). It contains user’s name, a serial number, expiration dates, a copy of the certificate holder's public key (used for encrypting and decrypting messages and digital signatures), and the digital signature of the certificate-issuing authority so that a recipient can verify that the certificate is real.
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