Re: signing all outbound email

2006-10-03 Thread James A. Donald
James A. Donald wrote: In order for [DKIM] to actually be any use, the recipient needs to verify the signature and do something on the basis of that signature - presumably whitelist email that genuinely comes from well known domains. Unfortunately, the MTA cannot reliably do

Re: signing all outbound email

2006-10-03 Thread John Levine
James A. Donald wrote: In order for [DKIM] to actually be any use, ... Anne Lynn Wheeler wrote: so what if an isp only signs email where ... etc, etc. You know, we've already had all these arguments on the DKIM mailing list about a hundred times. It's true, just about everything that

Re: Circle Bank plays with two-factor authentication

2006-10-03 Thread leichter_jerrold
| Have you seen the technique used at http://www.griddatasecurity.com ? Sounds | a lot like your original idea. Nah - more clever than what I had (which was meant for an age when you couldn't carry any computation with you, and things you interacted with on a day by day basis didn't have

Re: Hamiltonian path as protection against DOS.

2006-10-03 Thread Florian Weimer
* James A. Donald: DOS is now a major problem - every business, online games, money movers, banks, porno sites, casinos, now comes under DOS attack from extortionists. How do Hamiltonian paths protect against the H.R.4411 attack? (Part of the DoS problem online casinos face is that due to

wanted: mod arith equivalences/tautologies

2006-10-03 Thread Travis H.
Hey does anyone have a good link for the various equivalencies (or inequivalencies) for modular arithmetic? I realize some will only apply to certain moduli, especially primes. I'm basically wanting to find some good algorithms for certain simple computations, like f(x) = ax + b (mod n), or the

Re: Hamiltonian path as protection against DoS.

2006-10-03 Thread James A. Donald
-- Florian Weimer wrote: How do Hamiltonian paths protect against the H.R.4411 attack? H.R.4411 is not a DoS attack. (Part of the DoS problem online casinos face is that due to their activity, which was illegal before, they are extremely reluctant to approach law enforcement about