Re: private credential/ecash thread on slashdot (Re: announce: credlib library with brands and chaum credentials)

2007-02-26 Thread Steve Schear

At 04:40 PM 2/20/2007, Adam Back wrote:

There is quite some underinformed speculation as critique on the
thread...  Its interesting to see people who probably understand SSL,
SMIME and stuff at least at a power user if not programmer level, try
to make logical leaps about what must be wrong or limited about
unlinkable credential schemes.  Shows the challenges faced in
deploying this stuff.  Cant deploy what people dont understand!


I certainly relate with that. Much of what is widely deployed fits that 
category with me. But then, look at how successful fiat money, paper money, 
is. That is certainly not understood by most, but it does not have the 
problem of lack of deployment. So maybe trust and understanding are not 
related with each other and we need to understand this point better.


In actuality, most stuff is not understood. Who understands how their cars 
work, or their airplane rides across the country, or their computers, 
banks, medical systems and on and on?


I say Adam has a good point, but maybe it's the wrong one. :)

Steve 


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private credential/ecash thread on slashdot (Re: announce: credlib library with brands and chaum credentials)

2007-02-21 Thread Adam Back
Credentica (Stefan Brands ecash/credentials) U-prove library and
open source credlib library implementing the same are on slashdot:

http://yro.slashdot.org/yro/07/02/20/2158240.shtml

Maybe some list readers would like to inject some crypto knowledge
into the discussion.  

There is quite some underinformed speculation as critique on the
thread...  Its interesting to see people who probably understand SSL,
SMIME and stuff at least at a power user if not programmer level, try
to make logical leaps about what must be wrong or limited about
unlinkable credential schemes.  Shows the challenges faced in
deploying this stuff.  Cant deploy what people dont understand!

Adam
--
http://www.cypherspace.org/credlib/

On Fri, Feb 16, 2007 at 11:14:39AM -0500, Adam Back wrote:
 Hi
 
 I implemented Chaumian and Brands credentials in a credential library
 (C code, using openSSL).  I implemented some of the pre-computation
 steps.  Have not made any attempt so far to benchmark it.  But thought
 I could take this opportunity to make it public.  I did not try to
 optimize so far.  One optimization opportunity at algorithm level, is
 you dont need witness indistinguishability on a single attribute
 credential, which saves some of the computations.
 
   http://www.cypherspace.org/credlib/
 
 Ben, if you have a partial implementation of Camenisch credentials,
 you could maybe do some comparisons of that against this C
 implementation.

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