certificate authority - definition. What is certificate authority
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Certificate Authority         
<cryptography, body> (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 function must be {cryptographically strong}, e.g. MD5. http://home.netscape.com/comprod/server_central/support/faq/certificate_faq.html#11. (1998-03-30)
Certificate authority         
In cryptography, a certificate authority or certification authority (CA) is an entity that stores, signs, and issues digital certificates. A digital certificate certifies the ownership of a public key by the named subject of the certificate.
Offline root certificate authority         
CERTIFICATE AUTHORITY WHICH HAS BEEN ISOLATED FROM NETWORK ACCESS
Off-line Root CA; Offline Root CA; Offline Root Certificate Authority
An offline root certificate authority is a certificate authority (as defined in the X.509 standard and ) which has been isolated from network access, and is often kept in a powered-down state.

ويكيبيديا

Certificate authority
In cryptography, a certificate authority or certification authority (CA) is an entity that stores, signs, and issues digital certificates. A digital certificate certifies the ownership of a public key by the named subject of the certificate.