Method and system for transmitting a set of data from a number sender device to a destination device, and device for analyzing a data set number

The invention relates to the transmission of encrypted data set from a sender device (1) to a destination device (6). A first communication module transmits the set of encrypted data. A second communication module (3c) with a dialogue module (4) of key archive to obtain at least one decryption key associated with the set of encrypted data transmitted. A module (D) decrypts the entire encrypted data transmitted using the obtained key. A first analyzing module (AN5) analyzes the set of decrypted data for detecting whether the latter contains an unwanted element by the recipient device (6). A third communication module (3a) transmits a message that the set of decrypted data includes or does not include such an unwanted element. A second analyzing module (AN2) analyzes the transmitted message such that a fourth communications module (2) transmits, toward the target device (6) or the encrypted set of data as transmitted initially by the sender device (1) or a warning message that the entire encrypted data comprises a non-desired element.