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Chapter 3
Configuration via Local Pages
Lifetime-secs
84
Crypto
The table below shows the encryption algorithms supported by the SpeedTouch™
along with their corresponding key size:
Algorithm
DES
3DES
AES
DES is relatively slow and is the weakest of the algorithms, but it is the
industry standard.
3DES is a stronger version of DES, but is the slowest of the supported
algorithms (for a comparable key length).
AES is the new encryption standard selected by the American government to
replace DES/3DES. It is recommended to use AES since it is the most
advanced of the supported encryption methods.
Integrity
The SpeedTouch™ supports two types of hashing algorithms:
Hashing algorithm
MD5
SHA1
HMAC is always used as integrity algorithm, combined with either MD5 or
SHA1.
SHA1 is stronger than MD5, but slightly slower.
Group
The table below shows the supported Diffie-Hellman groups:
Diffie-Hellman group
number
1
2
5
The lifetime of a Security Association is specified in seconds:
Lifetime measured in:
seconds
Valid key lengths (bits)
56
168
128, 192, 256
number of bits
768
1024
1536
Minimum value
240 (=4 minutes)
Keyword
MODP768
MODP1024
MODP1536
Maximum value
31536000 (=1 year)
E-DOC-CTC-20051017-0169 v0.1
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