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Chapter 3
Configuration via Local Pages
E-DOC-CTC-20051017-0169 v0.1
84
Crypto The table below shows the encryption algorithms supported by the SpeedTouch™
along with their corresponding key size:
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:
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:
Lifetime-secs The lifetime of a Security Association is specified in seconds:
Algorithm Valid key lengths (bits)
DES 56
3DES 168
AES 128, 192, 256
Hashing algorithm
MD5
SHA1
Diffie-Hellman group
number
number of bits Keyword
1 768 MODP768
2 1024 MODP1024
5 1536 MODP1536
Lifetime measured in: Minimum value Maximum value
seconds 240 (=4 minutes) 31536000 (=1 year)