Circle Bank plays with two-factor authentication

[leichter_jerrold at emc.com]

| 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 displays).

GridCode's idea is quite clever, but the fact that it's ultimately a
simple substitution - a varying simple substitution, but of a fixed
value - seems dangerous.  No obvious (to me!) attacks, though....

							-- Jerry


---------------------------------------------------------------------
The Cryptography Mailing List
Unsubscribe by sending "unsubscribe cryptography" to majordomo at metzdowd.com