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・ cepstra
・ cepstrum
・ cept
・ cer
・ ceramic pin grid array
・ ceres workstation oberon system
・ cerf, vint
・ cern
・ cernlib
・ cert
certificate authority
・ cesp
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・ cfd
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certificate authority : FOLDOC
Certificate Authority
(CA or "Trusted Third Party") An entity (typically a company) that issues {digital certificates} to other entities (organisations or individuals) to allow them to prove their identity to others. A Certificate Authority might be an external company such as {VeriSign} that offers digital certificate services or they might be an internal organisation such as a corporate MIS department. The Certificate Authority's chief function is to verify the identity of entities and issue digital certificates attesting to that identity.
The process uses public-key cryptography to create a "network of trust". If I want to prove my identity to you, I ask a CA (who you trust to have verified my identity) to encrypt a hash of my signed key with their private key. Then you can use the CA's {public key} to decrypt the hash and compare it with a hash you calculate yourself. Hashes are used to decrease the amount of data that needs to be transmitted. The hash f


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