ZyXEL Communications ZyXEL ZyWALL 35 - Manual (Page 91)

ZyWALL 35 User’s Guide
Chapter 3 Wizard Setup 89
An added feature of the ESP is payload padding, which further protects communications by
concealing the size of the packet being transmitted.
Table 18 ESP and AH
ESP AH
Encryption DES (default)
Data Encryption Standard (DES) is a
widely used method of data encryption
using a secret key. DES applies a 56-bit
key to each 64-bit block of data.
3DES
Triple DES (3DES) is a variant of DES,
which iterates three times with three
separate keys (3 x 56 = 168 bits),
effectively doubling the strength of DES.
AES
Advanced Encryption Standard is a
newer method of data encryption that
also uses a secret key. This
implementation of AES applies a 128-bit
key to 128-bit blocks of data. AES is
faster than 3DES.
Select NULL to set up a phase 2 tunnel
without encryption.
Authentication MD5 (default)
MD5 (Message Digest 5) produces a
128-bit digest to authenticate packet
data.
MD5 (default)
MD5 (Message Digest 5) produces a
128-bit digest to authenticate packet
data.
SHA1
SHA1 (Secure Hash Algorithm) produces
a 160-bit digest to authenticate packet
data.
SHA1
SHA1 (Secure Hash Algorithm) produces
a 160-bit digest to authenticate packet
data.
Select MD5 for minimal security and SHA-1 for maximum security.