Or a user can transmit his or her certificate

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Unformatted text preview: e same CA, then there is a common trust of that CA • User certificates can be placed in the directory for access by all users. • Or a user can transmit his or her certificate directly to other users. – In either case, once B is in possession of A's certificate, B has confidence that messages it encrypts with A's public key will be secure from eavesdropping and that messages signed with A's private key are unforgeable Public Key Certificates • If there is a large community of users, it may not be practical for all users to subscribe to the same CA • Because it is the CA that signs certificates, each participating user must have a copy of the CA's own public key to verify signatures • This public key must be provided to each user in an absolutely secure X.509...
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