* James A. Donald:
Is there a way of constructing a digital signature so
that the signature proves that at least m possessors of
secret keys corresponding to n public keys signed, for n
a dozen or less, without revealing how many more than m,
or which ones signed?
What about this?

James A. Donald writes:
-+---
| Is there a way of constructing a digital signature so
| that the signature proves that at least m possessors of
| secret keys corresponding to n public keys signed, for n
| a dozen or less, without revealing how many more than m,
| or which

Is there a way of constructing a digital signature so
that the signature proves that at least m possessors of
secret keys corresponding to n public keys signed, for n
a dozen or less, without revealing how many more than m,
or which ones signed?
Yes there are a number of ways. Usually they