Digital Signature - The certificate authority...
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The certificate authority is a trusted entity that issues certificates to end entities and other Certificate Authorities. Another important thing that Certificate Authority does is to issue Certificate Revocation Lists (CRLs) periodically and post certificates and CRLs to a database or repository.
The overall process is illustrated in the figure below:
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System A performs a sign operation that uses A’s private key to generate the signature. System B performs a verify operation that uses system A’s public key and that allows system B to be sure that a received message originated from system A and that the contents were not modified since it left system A.
In some respects, a digital signature is similar to an integrity check value (check digit). However, there is one major difference. A digital signature must be able to support non-repudiation, that is, a recipient of a message must be able to use the digital signature to convince a third party as to the identity of the originator.
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