Cisco 3002 - VPN Hardware Client Guía de usuario Pagina 79

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Configuration | System | Management Protocols | SSL
8-11
VPN 3002 Hardware Client User Guide
RC4-40/MD5 Export = RC4 encryption with a 128-bit key—40 bits of which are private—and the MD5
hash function. This option is available in the export (non-U.S.) versions of many SSL clients.
DES-40/SHA Export = DES encryption with a 56-bit key—40 bits of which are private—and the
SHA-1 hash function. This option is available in the export (non-U.S.) versions of many SSL
clients.
Client Authentication
This parameter applies to HTTPS only; it is ignored for Telnet/SSL.
Check the box to enable SSL client authentication. The box is not checked by default. In the most
common SSL connection, the client authenticates the server, not vice-versa. Client authentication
requires personal certificates installed in the browser, and trusted certificates installed in the server.
Specifically, the VPN 3002 must have a root CA certificate installed; and a certificate signed by one of
the VPN 3002’s trusted CAs must be installed in the Web browser. See
Administration | Certificate
Management
.
SSL Version
Click the drop-down menu button and select the SSL version to use. SSL Version 3 has more security
options than Version 2, and TLS (Transport Layer Security) Version 1 has more security options than
SSL Version 3. Some clients that send an SSL Version 2 “Hello (initial negotiation), can actually use a
more secure version during the session. Telnet/SSL clients usually can use only SSL Version 2.
Choices are:
Negotiate SSL V2/V3 = The server tries to use SSL Version 3 but accepts Version 2 if the client can’t
use Version 3. This is the default selection. This selection works with most browsers and Telnet/SSL
clients.
SSL V3 with SSL V2 Hello = The server insists on SSL Version 3 but accepts an initial Version 2
“Hello.”
SSL V3 Only = The server insists on SSL Version 3 only.
SSL V2 Only = The server insists on SSL Version 2 only. This selection works with most Telnet/SSL
clients.
TLS V1 Only = The server insists on TLS Version 1 only. At present, only Microsoft Internet Explorer
5.0 supports this option.
TLS V1 with SSL V2 Hello = The server insists on TLS Version 1 but accepts an initial SSL Version 2
“Hello.” At present, only Microsoft Internet Explorer 5.0 supports this option.
Generated Certificate Key Size
Click the drop-down menu button and select the size of the RSA key that the VPN 3002 uses in its
self-signed (generated) SSL server certificate. A larger key size increases security, but it also increases
the processing necessary in all transactions over SSL. The increases vary depending on the type of
transaction (encryption or decryption).
Choices are:
512-bit RSA Key = This key size provides sufficient security. It is the most common, and requires the
least processing.
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