An aspect includes storing data elements in a storage space of a memory device. The storage space is allocated for an account of a subscriber of a universal subscriber identification system. An aspect also includes assigning subscriber-inputted security levels to the data elements. The security levels define varying degrees of access protections associated with the data elements. An aspect further includes generating a security envelope that includes a data element selected from the storage space. The security envelope is configured with an access protection scheme that is commensurate with a corresponding assigned security level. An aspect also includes providing access to the selected data element by another subscriber of the universal subscriber identification system via the security envelope. The access is provided in accordance with the access protection scheme.