-----BEGIN PGP SIGNED MESSAGE----- On Thu, 14 Nov 1996, Peter Hendrickson wrote:
I read awhile ago that certain members of Parliament do not speak their mind regarding the situation in Northern Ireland. The reason they give is that they have children and they fear the IRA.
There are times when one wishes to speak anonymously, yet speak as a member of a group.
Is there a way to take published public keys and combine them with your own in such a way that your identity is not compromised, but it is clear beyond a doubt that you control one of a set of public keys?
One way would be to have some trusted third party issue a signature for any key that belongs to a member of the group. The problem with this method is that the certificate issuer knows which keys belong to which members. This can be solved by blind-signing the keys. A single secret key could be distributed to every member, but this is vulnerable to security problems. Also, it would be impossible to determine if a group of messages were each issued by different people or if it was the same person. I don't know if there is any better cryptographic protocol to handle a situation like this. Oblivious signatures might be a possibility, but I don't know how they work and if they could be used in such a protocol. Mark - -- finger -l for PGP key PGP encrypted mail prefered. -----BEGIN PGP SIGNATURE----- Version: 2.6.3 Charset: noconv iQEVAwUBMowjzizIPc7jvyFpAQGWnQf/fH+RLAE8AUW8CrASprXuHZH/z2/30M6l zWeC8E43dh1Hy4YLqeNyKNblHp717vla2/EeOJQUuKN0FBMdJoJVGP+dH4BKMgWA mobfOhq+n+vDQCvwonkrjy2oq5+2ULS6uIkGLvaMRrCWwJ9wElE6LHOAo/Tz9Y8p 71ICTn6k9z6V67Aeu/5q0GyY4QrLdPZqxNpjW7LqGkV5LNTTttqxCiWlrpRqLRJu 81qgBrDZtTG0nB8emqW3lpTag48yyeePAAYMuryLQ3y7lDfrQloZ+t5MtOgnrUlw dVvQ2hIn9KVNKlkmJi/7aLFUZxp5jNaEtP1+LxPGHouiJC3utp3cJA== =I6hn -----END PGP SIGNATURE-----