ZyXEL Communications P-2612HW-F1 User Manual page 269

Table 77 Security > VPN > Setup > Edit
LABEL
Encryption
Algorithm
Authentication
Algorithm
Back
Apply
Cancel
Advanced Setup
P-2612HW-F1 User's Guide
DESCRIPTION
Select DES, 3DES, AES or NULL from the drop-down list box.
When you use one of these encryption algorithms for data
communications, both the sending device and the receiving device
must use the same secret key, which can be used to encrypt and
decrypt the message or to generate and verify a message
authentication code. The DES encryption algorithm uses a 56-bit key.
Triple DES (3DES) is a variation on DES that uses a 168-bit key. As a
result, 3DES is more secure than DES. It also requires more
processing power, resulting in increased latency and decreased
throughput. This implementation of AES uses a 128-bit key. AES is
faster than 3DES.
Select NULL to set up a tunnel without encryption. When you select
NULL, you do not enter an encryption key.
Select SHA1 or MD5 from the drop-down list box. MD5 (Message
Digest 5) and SHA1 (Secure Hash Algorithm) are hash algorithms used
to authenticate packet data. The SHA1 algorithm is generally
considered stronger than MD5, but is slower. Select MD5 for minimal
security and SHA-1 for maximum security.
Click Back to return to the previous screen.
Click Apply to save your changes back to the ZyXEL Device.
Click Cancel to begin configuring this screen afresh.
Click Advanced Setup to configure more detailed settings of your IKE
key management.
Chapter 14 VPN
269