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48 RiverMaster Administrator’s Guide
Tunnel Protocols
Chapter 3
Configuring an ANG-3000/7000
10
Click the Compression tab.
Table 3 Encryption Parameters
Tunnel
Protocol
Parameter Explanation
IPSec None Disables encryption on the tunnel; because this results
in a less secure connection, this setting is not
recommended.
ARCFOUR 40 bit Enables a 40-bit key public domain algorithm that is
designed to work with Rivest Cipher 4 (RC4), a
stream-based cipher method that supports both 40-bit
and 128-bit keys. Using RC4, data packets can be
encrypted as they are received instead of in blocks.
ARCFOUR 128 bit Enables a 128-bit key version of ARCFOUR (described
above).
DES Enables Data Encryption Standard (DES), a block
cipher method that uses 56-bit keys. Using DES, data is
encrypted in fixed-size blocks and packets are padded
to become a multiple of the block size.
Triple-DES Enables a version of DES (described above) that
employs a DES encryption with one key, a decryption
with a second key, and then another encryption with a
third key. The result is equivalent to DES with a 112-bit
key.
PPTP MPPE (40 bit) Enables 40-bit key Microsoft Point-to-Point Encryption
(MPPE) which generates a key based on a hash of the
user’s password and invokes RC4 encryption. This type
of encryption is supported by
Windows 95/98/NT/2000/ME computers without any
additional software.
MPPE (128 bit) Enables 128-bit key MPPE on the tunnel. To support
128-bit keys, the Aurorean computer must receive a
128-bit encryption upgrade available from Microsoft.
This upgrade may not be available to users outside the
U.S.