comments on web crypto API: Diffie-Hellman parameters [3/6] from Nikos Mavrogiannopoulos on 2013-05-23 (public-webcrypto-comments@w3.org from May 2013)

From: Nikos Mavrogiannopoulos <nikos.mavrogiannopoulos@esat.kuleuven.be>
Date: Thu, 23 May 2013 10:42:30 +0200
To: <public-webcrypto-comments@w3.org>
Cc: danny de cock <Danny.DeCock@esat.kuleuven.be>, Filipe Beato <filipe.beato@esat.kuleuven.be>
Message-ID: <47dde8d253aae902088891a05d0e5bda@esat.kuleuven.be>

The diffie-hellman parameters in 19.13.3 are restricted to the prime 
and generator. With that information special parameters that allow for 
optimizations (see "Computational Introduction to Number Theory and 
Algebra" by V. Shoup) are not allowed (an example is when p=2wq+1). An 
easy way to overcome this restriction would be to add an additional 
parameter that indicates the desired size of the private key, similarly 
to PKCS #3 format for DH.

Received on Thursday, 23 May 2013 10:12:58 UTC