| http://www.w3.org/ns/prov#value | - These individual public keys of the signers are combinable. (E.g., in a manner similar to that described in Harn, in which case, the PKi and SKi keys can be, respectively, public and secret keys of an El Gamal signature scheme in the same range so that each individual public key may be a number between 1 and p-1, where p is a prime number, preferably one thousand bits long.)
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