Re: Shell's authentication needs

Rich Salz writes:

Shell needs public key because they want to use email for legal contracts. They've been waiting for standards to come around, but have given up. They're currently planning on using NIST's DSS, if they can fix a few things: - Add concepts of time and location (it can be important to prove that this was signed last month outside of the U.S.)

Any thoughts on how digital "place-stamping" (analogous to timestamping) might be accomplished, to authenticate the location of origin of a document ? -L. McCarthy / seeking a summer job/internship; BS CS Cornell & 2 years' grad work in theoretical CS (algebraic algorithms); private email for info