A method of storing and retrieving a utilization data associated to a sensitive information which requires to be secured in an environment including a plurality of application systems that can use the information, includes: at a given application system of the plurality of application systems: receiving the information, generating from the information an extracted data and a complementary data, generating an encoded information from the information, sending the extracted data and the encoded information to a server system, at the server system: generating an index and assigning it to the encoded information and the extracted data, storing the encoded information, the extracted data, and the index in a database associated to the server system, forwarding the index to the given application system of the plurality of application systems, at the given application system: assigning the index to an application stored data related to the information, storing the index and the application stored data in a database associated to said given application server.