Abstract: In a secure end-to-end transmission of data between a first device and a second device via a message broker, the following are performed: a sharing of an entropy pool between the first device and the second device via the message broker, by means of signalling messages, any payload of which is encrypted asymmetrically and which comprise a message signature; and a transmission of subsequent messages between the first device and the second device via the message broker, each said subsequent message comprising a header and a payload, the header comprising an identifier of an authentication key obtained from the shared entropy pool and an identifier of a symmetrical encryption key obtained from the shared entropy pool, the payload being encrypted symmetrically by means of the symmetrical encryption key, and the whole formed by the header and the payload being authenticated by means of a message authentication code obtained by means of the authentication key and inserted in the header.

Abstract: A sound playback method implemented in a system including an audio/video decoder and a plurality of pieces of audio playback equipment that have been grouped together in the same audio group, the method comprising the steps of defining a first subgroup comprising the audio/video decoder and at least one first piece of audio playback equipment, and a second subgroup comprising at least one second piece of audio playback equipment; dynamically determining a current mode that is occupied by the system; when the system is in the first mode, causing the first subgroup to play back a first audio signal comprising a common audio content, and causing the second subgroup to play back a second audio signal comprising the common audio content; when the system is in the second mode, causing the first subgroup to play back a third audio signal comprising an audio stream forming part of the audio-video stream, and causing the second subgroup to play back a fourth audio signal.

Abstract: In a secure end-to-end transmission of data between a first device and a second device via a message broker, the following are performed: a sharing of an entropy pool between the first device and the second device via the message broker, by means of signalling messages, any payload of which is encrypted asymmetrically and which comprise a message signature; and a transmission of subsequent messages between the first device and the second device via the message broker, each said subsequent message comprising a header and a payload, the header comprising an identifier of an authentication key obtained from the shared entropy pool and an identifier of a symmetrical encryption key obtained from the shared entropy pool, the payload being encrypted symmetrically by means of the symmetrical encryption key, and the whole formed by the header and the payload being authenticated by means of a message authentication code obtained by means of the authentication key and inserted in the header.