Access authentication in a dispersed storage network

A computing device comprising:

• an interface configured to interface and communicate with a storage network;
• memory that stores operational instructions;
• and
• a processing module operably coupled to the interface and to the memory, wherein the processing module, when operable within the computing device based on the operational instructions, is configured to:
• receive a memory access request for a data object stored within the storage network, wherein the data object is segmented into a plurality of data segments, wherein a data segment of the plurality of data segments is dispersed error encoded in accordance with dispersed error encoding parameters to produce a set of encoded data slices, wherein the set of encoded data slices are distributedly stored among a plurality of storage units, wherein a decode threshold number of encoded data slices are needed to recover the data segment;
• determine a realm for the memory access request, wherein a realm indicates an affiliation with one or more users;
• determine an authorization service for the realm, wherein the authorization service includes a third-party, wherein the third party is configured to provide authorization information for the realm;
• and
• for each storage unit of the plurality of storage units:
• generate an authorization request for the memory access request;
• transmit the authorization request to an authorization service;
• receive an authorization request response from the authorization service;
• determine, based on the authorization request response, whether the memory access request is authorized;
• and
• in response to a determination that the memory access request is authorized, process the memory access request.