ZyXEL FSG2200HNU User Guide - Page 177
Certificates, 13.1 Overview, 13.1.1 What You Can Do in this What You Need to Know
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CHAPTER 13 Certificates 13.1 Overview The ZyXEL Device can use certificates (also called digital IDs) to authenticate users. Certificates are based on public-private key pairs. A certificate contains the certificate owner's identity and public key. Certificates provide a way to exchange public keys for use in authentication. 13.1.1 What You Can Do in this Chapter • Use the My Certificate screens (see Section 13.2 on page 180) to view and import the ZyXEL Device's CA-signed certificates. • Use the Trusted CA screens (see Section 13.3 on page 182) to save the certificates of trusted CAs to the ZyXEL Device. You can also export the certificates to a computer. 13.1.2 What You Need to Know The following terms and concepts may help as you read this chapter. Certification Authorities A Certification Authority (CA) issues certificates and guarantees the identity of each certificate owner. There are commercial certification authorities like CyberTrust or VeriSign and government certification authorities. Public and Private Keys When using public-key cryptology for authentication, each host has two keys. One key is public and can be made openly available; the other key is private and must be kept secure. Public-key encryption in general works as follows. 1 Tim wants to send a private message to Jenny. Tim generates a public-private key pair. What is encrypted with one key can only be decrypted using the other. 2 Tim keeps the private key and makes the public key openly available. FSG2200HNU User's Guide 177