Method for transmitting and receiving data, in particular for secure exchanges between an aircraft and a ground base, related devices and aircraft equipped with such devices

1. A method for emission of data, comprising:

determining an authentication word for the data, the authentication word relating to the data before processing;

processing the data to obtain processed data, the processing including an encryption of the data and a compression of the encrypted data; and

emitting the processed data on a transmission channel.

2. The emission method according to claim 1 , wherein the determining includes application of a hash function to the data.

3. The emission method according to claim 2 , wherein the application of the hash function uses a cryptographic key.

4. The emission method according to claim 1 , wherein the encryption is applied to the data and to the authentication word.

5. The emission method according to claim 1 , wherein the processing includes conversion of 8-bit words to 6-bit words.

6. The emission method according to claim 1 , wherein the transmission channel is a channel for exchange of data between an aircraft and a ground base.

7. A method for reception of data, comprising:

receiving of the data on a transmission channel;

processing of the received data, the processing including a decompression of the received data and a decryption of the decompressed data; and

verifying of authentication of the processed data.

8. The reception method according to claim 7 , wherein the verifying: includes

calculating of an imprint of at least part of the processed data; and

comparing of the calculated imprint with a received imprint.

9. The reception method according to claim 8 , wherein the calculating of the imprint includes application of a hash function to the part of the data.

10. The reception method according to claim 9 , wherein the application of the hash function uses a cryptographic key.

11. The reception method according to claim 9 , wherein the received imprint is a result of application, during emission, of the hash function to the data to be emitted.

12. The reception method according to claim 7 , wherein the processing includes deconversion of 6-bit words to 8-bit words.

13. The reception method according to claim 7 , wherein the transmission channel is a channel for exchange of data between an aircraft and a ground base.

14. A data emission device, comprising:

means for determining an authentication word for the data, the authentication word relating to the data before processing;

means for processing the data to obtain processed data, the means for processing including an encryption of the data and a compression of the encrypted data; and

means for emitting the processed data on a transmission channel.

15. The emission device according to claim 14 , wherein the means for determining includes means for applying a hash function to the data.

16. A data reception device, comprising:

means for receiving data on a transmission channel;

means for processing the received data, the means for processing including a decompression of the received data and a decryption of the decompressed data; and

means for verifying authentication of the processed data.

17. The reception device according to claim 16 , wherein the means for verifying includes means for applying a hash function to at least part of the processed data to obtain a calculated imprint, and means for comparing the calculated imprint with a received imprint.

18. An aircraft comprising:

a device including

a determining unit configured to determine an authentication word for the data, the authentication word relating to the data before processing,

a processing unit configured to process the data to obtain processed data, the process including an encryption of the data and a compression of the encrypted data, and

an emitting unit configured to emit the processed data on a transmission channel.