Abstract: A system for distributed secure storage of personal data, notably biometric data, a secure identity monitoring system and a local monitoring device, and a secure identity monitoring method. The personal data of persons, notably biometric impressions, are stored beforehand in a central database. The monitoring method includes: a preliminary step of constituting a database of derived data obtained from original personal data by means of a derivation function; a step of acquisition of data for the person; a step of application of the derivation function to said acquired data; a step of comparison of the result of the derivation function with all of the derived data from the database.

Abstract: A secure transmission is performed between at least one sender and one recipient, a method of which includes: a step of authenticating the sender to a trusted network to request the encryption of the data; a step of encryption of the data by the trusted network with the aid of an encryption key; a step of slicing the encryption key into arbitrary blocks; a step of storing the blocks in a memory space; a step of generation of an index including the sequence of addresses of the blocks in the memory space; a step of delivery, by the trusted network, of the encrypted data and of the index to the sender; the encrypted data and the index being transmitted to the recipient via a network, the recipient being able to authenticate himself with the trusted network to provide it with the encrypted data and the index, the trusted network reconstructing the encryption key on the basis of the index to decrypt the encrypted data and restoring the decrypted data to the recipient.