On Tue, 24 Jan 1995, Jonathan Rochkind wrote:
It's not as elegant as time stamping, because you really need face-to-face contact. And you need to trust the stamper not to lie about his location (I can't remember how much you need to trust a time-stamper, but I think it's less).
You do not need to trust the time stamper at all, because from time to time he publishes a one way checksum of everything he has time stamped, or rather the audit trail for everything he has time stamped. So if the credibility of his stamp is questioned he just produces the audit trail, and you know that the audit trail must have been created at the time claimed, because its checksum was published at the time claimed. --------------------------------------------------------------------- | We have the right to defend ourselves | http://www.catalog.com/jamesd/ and our property, because of the kind | of animals that we are. True law | James A. Donald derives from this right, not from the | arbitrary power of the omnipotent state. | jamesd@netcom.com