Algorithm 3: Linguistic threshold schemes.

Step 1. Defining (selecting) the service (or information specifying a given service) subject to the concealment process. Step 2. Specifying important characteristic features of the concealed service: —linguistic description of a concealed set by means of a sequential/tree/graph formalism, Step 3. Execution of the services sharing protocol: —specifying the type of division of the concealed services-equal/privileged allocation —selecting the (m, n)-threshold scheme, —specifying the n of all the protocol participants, —defining the m minimal number of shadows required to re-create the secret Step 4. Execution of the services sharing protocol: —allocation shadows among all the protocol participants, —specifying the minimum number of shadows necessary to re-produce the shared information, —reproducing the concealed information by means of putting together the required number of shadows.