Chapter 3

Configuration via Local Pages

Parameter table The following table summarizes the parameters comprised in the connection security descriptor:

Parameter

Description

 

 

Descriptor name

Symbolic name to identify the Descriptor.

 

 

Crypto

Cryptographic function to be used for the IPSec Security

Association.

 

 

 

Integrity

Hashing function used for message authentication.

 

 

Encapsulation

Selects the ESP encapsulation mode.

 

 

PFS

Selects the use of Perfect Forward Secrecy

 

 

Lifetime-secs

The lifetime of the IPSec Security Association. At

expiration of this period re-keying occurs.

 

 

 

Lifetime-kbytes

The maximum data volume transported before re-keying

occurs.

 

 

 

Connection Descriptor Internal symbolic name to identify the Connection Descriptor. name

Crypto The table below shows the cryptographic functions supported by the SpeedTouch™ along with their corresponding key size:

Algorithm

Valid key lengths (bits)

 

 

DES

56

 

 

3DES

168

 

 

AES

128, 192, 256

 

 

NULL

-

 

 

DES is relatively slow and is the weakest of the algorithms, but it is the industry standard.

3DES is a stronger version of DES, but is the slowest of the supported algorithms (for a comparable key length).

AES is the new encryption standard selected by the American government to replace DES/3DES. It is recommended to use AES since it is the most advanced of the supported encryption methods.

NULL encryption: The message is not encrypted. Selecting NULL encryption achieves authentication without encryption, being equivalent to the use of the Authentication Header (AH) that is no longer supported from Release R5.3.0 onwards.

In addition, NULL encryption may be useful for testing purposes since the messages on the communication link can be interpreted. Message authentication remains active.

E-DOC-CTC-20051017-0169 v0.1

97

 

Page 99
Image 99
Nortel Networks 608(WL), 620 manual Algorithm Valid key lengths bits, Pfs