A processor-implemented information access control method based on trustworthiness computing mechanism, comprising: providing to an information owner an information structure including at least in partition a set of quasi identifiers available from a plurality of auxiliary sources, and in at least other partition a sensitive information associated with the information owner, wherein the quasi identifiers are information pointers associated with the information owner and point to one or more secret attributes of the sensitive information and have the potential to identify secret information, and auxiliary sources are sources other than the information owner; receiving at the information owner, request from one or more consumers to share the sensitive information; computing a trust score for each of the request from one or more consumers based on a probability score indicative of the sensitive information privacy breach to obtain trustworthiness for the one or more consumers, wherein said probability score is evaluated from an exploitation factor, the exploitation factor being the product of the availability of quasi identifiers to the corresponding consumer and the potency of each of the quasi identifiers to expose privacy of the sensitive information, wherein the availability of a quasi identifier is determined by the number of auxiliary sources present and the degree of accessibility of the number of auxiliary sources for the one or more consumers, and wherein the potency of a quasi identifier is an ability of the quasi identifier to uniquely identify the information owner within a population of the available set of quasi identifiers; and enabling the information owner to negotiate upon degree of the sensitive information to be shared therewith and restrictively shared with the one or more consumers based on the trust score. providing to an information owner an information structure including at least in partition a set of quasi identifiers available from a plurality of auxiliary sources, and in at least other partition a sensitive information associated with the information owner, wherein the quasi identifiers are information pointers associated with the information owner and point to one or more secret attributes of the sensitive information and have the potential to identify secret information, and auxiliary sources are sources other than the information owner; receiving at the information owner, request from one or more consumers to share the sensitive information; computing a trust score for each of the request from one or more consumers based on a probability score indicative of the sensitive information privacy breach to obtain trustworthiness for the one or more consumers, wherein said probability score is evaluated from an exploitation factor, the exploitation factor being the product of the availability of quasi identifiers to the corresponding consumer and the potency of each of the quasi identifiers to expose privacy of the sensitive information, wherein the availability of a quasi identifier is determined by the number of auxiliary sources present and the degree of accessibility of the number of auxiliary sources for the one or more consumers, and wherein the potency of a quasi identifier is an ability of the quasi identifier to uniquely identify the information owner within a population of the available set of quasi identifiers; and enabling the information owner to negotiate upon degree of the sensitive information to be shared therewith and restrictively shared with the one or more consumers based on the trust score.