Motorola MC3090G Integration Guide - Page 134

6 - 12 MC3000 Integrator Guide Table 6-9 TTLS Tunneled Authentication Options (Continued) TTLS Tunneled Authentication Description MS CHAP v2 MS CHAP v2 is a password based, challenge response, mutual authentication protocol that uses the industry standard Message Digest 4 (MD4) and Data Encryption Standard (DES) algorithms to encrypt responses. The authenticating server challenges the access client and the access client challenges the authenticating server. If either challenge is not correctly answered, the connection is rejected. MS CHAP v2 was originally designed by Microsoft as a PPP authentication protocol to provide better protection for dial-up and virtual private network (VPN) connections. With Windows XP SP1, Windows XP SP2, Windows Server 2003, and Windows 2000 SP4, MS CHAP v2 is also an EAP type. PAP Password Authentication Protocol (PAP), has two variations PAP and CHAP PAP. It verifies a user name and password for PPP Internet connections, but it is not as secure as CHAP, since it works only to establish the initial link. PAP is also more vulnerable to attack because it sends authentication packets throughout the network. Nevertheless, PAP is more commonly used than CHAP to log in to a remote host like an Internet service provider. MD5 Message Digest-5 (MD5) is an authentication algorithm developed by RSA. MD5 generates a 128-bit message digest using a 128-bit key, IPSec truncates the message digest to 96 bits. User Certificate Selection If the User Certificate check box on the Tunneled Authentication dialog box is checked or if TLS is the selected authentication type, then the Installed User Certificates dialog box displays. The user is required to select a certificate before proceeding. Select a certificate from the drop-down list of currently installed certificates. When a certificate is selected its name appears in the drop-down list. If the required certificate is not in the list, it must be installed. Figure 6-12 Installed User Certs Dialog Box User Certificate Installation To install a user certificate (EAP TLS only) and a server certificate for EAP TLS and PEAP authentication: 1. Tap Install Certificate. The Credentials dialog box appears.