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1. (WO2018087255) METHOD AND DEVICE FOR TRANSMITTING ENCRYPTED DATA, METHOD AND DEVICE FOR EXTRACTING DATA

Pub. No.:    WO/2018/087255    International Application No.:    PCT/EP2017/078809
Publication Date: Fri May 18 01:59:59 CEST 2018 International Filing Date: Fri Nov 10 00:59:59 CET 2017
IPC: H04L 9/08
H04L 9/32
Applicants: SIGFOX
Inventors: LARIGNON, Guillaume
Title: METHOD AND DEVICE FOR TRANSMITTING ENCRYPTED DATA, METHOD AND DEVICE FOR EXTRACTING DATA
Abstract:
The present invention relates to a method (50) for transmitting, by means of a transmitter device (20), a packet to a receiver device (30) of a communication system, said packet including data encrypted according to a symmetric key encryption protocol, including: - determining (51) the value of an item of generation information; - determining (52) an encryption key according to the value of the generation information; - encrypting (53) the data to be included in the encrypted packet to be transmitted according to the encryption key; - calculating (54) a truncated item of information on the basis of the generation information; - calculating (55) a verification code for the encrypted packet according to the encrypted data and the first portion of the generation information; - forming (56) the encrypted packet to be transmitted on the basis of the truncated information, the verification code and the encrypted data.