This invention aims to propose a method and a system allowing to supply certified reliable information without the source of the information being transmitted to the applicant.This invention proposes an access method to the data of at least one person or company or object, stored in a secure database on a removable support, these data comprising quantitative or qualitative data, each datum comprising at least one describer and one value, this method comprising steps of initialization and of use, the initialization comprising the following steps: connecting the removable support to a device for acquiring information, authenticating at the database by demonstrating the right to at least one update, updating into the secure database, for a person or a company or an object, a current value corresponding to the describer of said datum; the use comprising the following steps: connecting the removable support to a communication device, receiving a request from an requesting party, this request comprising at least one target describer and one operator, carrying out, by the respondent, the request by applying the operator on the current value corresponding to the target describer and producing a response, returning the response to the requesting party.