# Secret sharing - no dealer, modifiable, verifiable

I need to find a secret sharing scheme with these properties:

• The scheme is set up by all participants, ie no single entity called the dealer

• The parameters of secret sharing need to be modifiable,eg enrollment, disenrollment, change of access structure, ...

• Need to be verifiable, ie participants could check whether their shares are consistant with others.

Is this scheme could be available at all !?

I'll appreciate any help to find that.

How is the secret to be determined in the first place? $\;$ –  Ricky Demer Jan 29 at 23:14