Avaya Business Secure Router 252 Configuration - Basics Uživatelský manuál stáhnout pdf (Strana 205)

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Chapter 13 VPN 205

Nortel Business Secure Router 252 Configuration — Basics

An added feature of the ESP is payload padding, which further protects

communications by concealing the size of the packet being transmitted.

Key management

Your Business Secure Router uses IKE (ISAKMP) key management in order to

set up a VPN.

Table 45 AH and ESP

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 3 times with 3 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 during

phase 1. You can configure the device

to use a 128-bit, 192-bit or 256-bit key

for phase 2. 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.

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