By Heinz Johner; et al

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If a Web server uses a certificate that is signed by such a trusted CA, clients are automatically considered to trust the server, unless the client intensionally deletes the signer CA certificate. A CA can issue several kinds of certificates, including: User certificates User certificates may be issued to an ordinary human being or other entities, such as servers and applications. They are trusted end-entities for the CA. An RA should also have this certificate. A user certificate may be limited to e-mail, servers, or for other specific purposes.

Some public key algorithms may be up to 1000 times slower than secret key algorithms. In order to overcome this problem, the concept of hashing is introduced. Hashing reduces the size of the original message before enciphering. 2, “Digital signatures” on page 10 for a more detailed discussion about hashing. • There must be a way of ensuring that the public key of a sender truly belongs to the sender, and not to somebody else, someone pretending to be the sender. This problem is addressed using certificates and Certificate Authorities (CAs).

A strong and total security solution is essential. The conventional user ID/password-based systems are inadequate. Certificates and public key cryptography seem to be good candidates for supporting strong security. But how are they going to be used? What will the security system look like? How can organizations plan and implement such an infrastructure? And, how can existing and new applications integrate with this security system? 1 The secure environment A strong, secure infrastructure incorporating certificates and public key cryptography may be a solution to the security needs of most organizations.

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