ZyXEL ENC User Guide - Page 334

Chapter 9 Maintenance Table 189 Log LABEL Event Message DESCRIPTION This field displays the event type to which the log belongs. This field states the reason for the log. 9.11 About Use this screen to see the ENC's software version, release date and copyright. To open this screen, click Maintenance > About. Figure 285 About The following table describes the fields in this screen. Table 190 About LABEL SoftWare Version Release Date Copyright DESCRIPTION This is the ENC's software version. This is the release date of the said software version. This shows copyright information such as the year when the software was released and the name of the company that released it. 9.12 Certificate Management The ENC 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. 9.12.1 What You Need to Know 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. These keys work like a handwritten signature (in fact, certificates are often referred to as "digital signatures"). Only you can write your signature exactly as it should look. When people know what your signature looks like, they can verify whether something was signed by you, or by someone else. In the same way, your private key "writes" your digital signature and your public key allows people to verify whether data was signed by you, or by someone else. This process works as follows. 1 Tim wants to send a message to Jenny. He needs her to be sure that it comes from him, and that the message content has not been altered by anyone else along the way. Tim generates a public key pair (one public key and one private key). 334 ENC User's Guide