METHOD AND DEVICE FOR EMITTING MESSAGES FOR GUARANTEEING THE AUTHENTICITY OF A SYSTEM AND METHOD AND DEVICE FOR VERIFYING THE AUTHENTICITY OF SUCH A SYSTEM
First Claim
1. A method for transmitting messages (MSG) to guarantee the authenticity of the system that transmitted said messages (MSG), comprising:
- selecting a threshold value (K) greater than or equal to 1;
generating a set of partial information items (132), such that knowledge of a number (i) of partial information items greater than or equal to the threshold value (K) makes it possible to verify a signature (133) of at least part of the messages (MSG); and
sending each partial information item separately in one of the distinct messages (MSG).
3 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a method for emitting messages in order to guarantee the authenticity of the system that emitted said messages. The method includes the following steps, namely: a step comprising the selection of a threshold value used in a threshold-based cryptographic scheme, which value is greater than or equal to 1;—a step comprising the generation of a set of partial information items, such that knowledge of a number i, greater than or equal to the threshold value K, of partial information items can be used to verify a signature of at least part of the messages; and a fourth step comprising the sending of each partial information item separately in a distinct message. The invention also relates to a device for emitting messages for guaranteeing the authenticity of the system that emitted the messages, as well as to a method and a device for verifying the authenticity of such a system. In particular, the invention is suitable for global satellite-based radiocommunication and radionavigation systems.
27 Citations
11 Claims
-
1. A method for transmitting messages (MSG) to guarantee the authenticity of the system that transmitted said messages (MSG), comprising:
-
selecting a threshold value (K) greater than or equal to 1; generating a set of partial information items (132), such that knowledge of a number (i) of partial information items greater than or equal to the threshold value (K) makes it possible to verify a signature (133) of at least part of the messages (MSG); and sending each partial information item separately in one of the distinct messages (MSG). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification