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Unable to download NetDirect from VPN server 181

Supported Cipher Strings and Meanings

The following table lists each supported cipher string alias and its

significance.

Table 7

Cipher Strings and Meanings

Cipher String Aliases Meaning

DEFAULT

The default cipher list, which corresponds to

ALL@STRENGTH.

ALL All cipher suites except the eNULL ciphers,

which must be explicitly enabled.

HIGH Cipher suites with key lengths larger than 128

bits.

MEDIUM Cipher suites using 128 bit encryption.

LOW Includes cipher suites using 64 or 56 bit

encryption, but excludes export cipher suites.

EXPORT Includes cipher suites using 40 and 56 bit

encryption.

EXPORT40 Cipher suites using 40 bit export encryption

only.

EXPORT56 Cipher suites using 56 bit export encryption

only.

eNULL, NULL Cipher suites that do not offer any encryption

at all. Because the use of such ciphers pose

a security threat, they are disabled unless

explicitly included.

aNULL Cipher suites that do not offer authentication,

like anonymous DH algorithms. The use

of such cipher suites is not recommended,

because they facilitate man-in-the-middle

attacks.

kRSA, RSA Cipher suites using RSA key exchange.

kEDH Cipher suites using ephemeral Diffie-Hellman

key agreement.

aRSA Cipher suites using RSA authentication, which

implies that the certificates carry RSA keys.

SSLv3, SSLv2 SSL version 3.0 and SSL version 2.0 cipher

suites, respectively.

DH Cipher suites using DH encryption algorithms,

including anonymous DH.

Nortel VPN Gateway

User Guide

NN46120-104 02.01 Standard

14 April 2008

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