Length of Triple DES algorithm

[Matthew Harding]

I have seen references to key length of triple DES ranging anywhere from
112 bits to 168, with stops of 128 bits in between.

Is there a well established length for 3DES? Do some vendors implement
3DES differently, or is it just a naming convention? Are there any
security implications between using 3DES with anything less than 168
bits? I had heard somewhere that the second transform with 3DES doesn't
actually add anything to the overall security, hence it is only really
112 bits of protection.

Any clarifications welcome!

Thanks,
Matthew

--
Matthew Harding, Director
NeuroTrain ATS Inc.
Tel: 1-877-58-NEURO (613-824-6397)
Fax: 613-841-2158
matt at neurotrain.com

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