[Hipsec] Reference problem in 5201-bis wrt SECP160R1

[Robert Moskowitz <[e-mail]>]

For low security we have SECP160R1 from:

    [SECG]                      SECG, "Recommended Elliptic Curve Domain
                                Parameters", SEC 2 , 2000,
                                <http://www.secg.org/>.

I went there yesterday to look up some of the information on actual 
sizes and got to:

http://www.secg.org/download/aid-784/sec2-v2.pdf, published Jan 27, 2010.

And no SECP160R1, the smallest keysize now is SECP192R1 (sec 2.2.2).

So we have a reference problem here as well as giving a developer the 
parameter values needed to implement SECP160R1.

Corrective action options:

1) Directly supply the parameters for SECP160R1 in Appendix D and 
reference the version of secg they were pulled from.

2) Find a more stable source for SECP160R1 to reference.

3) Move to SECP192R1 (which I am leary of as ver 3.0 of secg could drop 
that!).

I vote for 1) and ask whoever has the older version of secg to forward 
the parameters for inclusion.

BTW, HIP DEX works a bit differently in that the keys generated from the 
ECDH exchange are only used in protecting HIP packets and a wrapped key 
exchange within HIP provides the keying material for session keys (eg 
ESP or 802.15.4 security).  So in DEX, using SECP160R1 may not be as 
much of a risk as in BEX, so I DO plan on providing the SECP160R1 
parameters in DEX.