ZyXEL Communications Vantage CNM 2.3 User Manual page 333

Table 131 Device Operation > Device Configuration > VPN > IPSec VPN > VPN
Connection > Add/Edit (Manual Key) (continued)
LABEL
Encryption
Algorithm
Authentication
Algorithm
Vantage CNM User's Guide
DESCRIPTION
This field is applicable when the Active Protocol is ESP. Select which
key size and encryption algorithm to use in the IPSec SA. Choices
are:
NULL - no encryption key or algorithm
DES - a 56-bit key with the DES encryption algorithm
3DES - a 168-bit key with the DES encryption algorithm
AES128 - a 128-bit key with the AES encryption algorithm
AES192 - a 192-bit key with the AES encryption algorithm
AES256 - a 256-bit key with the AES encryption algorithm
The ZyWALL and the remote IPSec router must use the same
algorithm and key. Longer keys require more processing power,
resulting in increased latency and decreased throughput.
Select which hash algorithm to use to authenticate packet data in the
IPSec SA. Choices are SHA1 and MD5. SHA1 is generally considered
stronger than MD5, but it is also slower.
The ZyWALL and remote IPSec router must use the same algorithm.
Chapter 11 IPSec VPN
333