Table 18 Esp And Ah - ZyXEL Communications ZyWall 35 User Manual

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

Encryption
Authentication
Chapter 3 Wizard Setup
ESP
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.
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.
Select MD5 for minimal security and SHA-1 for maximum security.
ZyWALL 35 User's Guide
AH
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.
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