Abstract: The present invention concerns a method in a network including at least a first device and a second device, where the sending of a packet by two devices simultaneously generates a collision. The method includes the steps of emitting by the first device a packet comprising a first part, and a second part including at least an identification of a source and a destination of the packet, receiving the first part of the packet by the second device; and in the case of the second device detecting a collision during the reception of the second part of the packet, issuing a packet indicating collision detection by the second device.

Abstract: A method for discovering emulated clients. A verifier sends a cryptographic challenge C to a client and preferably starts a timer. The client uses a deterministic key search algorithm to find the correct key and returns the result as a number of tries needed. The verifier then stops the timer if this was started and verifies that the result is correct and preferably that the response was timely. Also provided is a verifier.

Abstract: The invention relates to a method for inserting a new device in a community of devices wherein each device of the community is able to store insertion requests received from at least one new device and to forward these insertion requests to a device chosen by a user of the community for confirming authorization to join the community.

Abstract: A cartridge preferably for use with a game console. The cartridge comprises a ROM, a non-volatile memory, a processor and an encryption unit. An application running on the console may read data from the ROM, read data from the non-volatile memory, and write data in the non-volatile memory. Data to be written in the non-volatile memory is encrypted by the encryption unit, but data to be read is returned in encrypted form for decryption by a decryption function of the game application. Data may also be received encrypted to be decrypted and returned. The encryption or decryption unit may also receive data from the non-volatile memory and send it to the interface. The invention improves on the prior art copy protection as a hacker must reverse engineer the game application in order to copy it, if the encryption unit is unknown. The invention also provides an optical medium equipped with a RFID circuit.

Abstract: A method for performing at least one evolution operation in a dynamic, evolutive community of devices in a network comprising at least a first device. The method comprises a step of sending at least one message over the network from the first device to a second device, wherein the first device continues the method without acknowledgement of the at least one message from the second device. The method is suitable for execution on clockless devices. A device for performing the method is also claimed.

Abstract: A cartridge preferably for use with a game console. The cartridge comprises a ROM, a non-volatile memory, a processor and an encryption unit. An application running on the console may read data from the ROM, read data from the non-volatile memory, and write data in the non-volatile memory. Data to be written in the non-volatile memory is encrypted by the encryption unit, but data to be read is returned in encrypted form for decryption by a decryption function of the game application. Data may also be received encrypted to be decrypted and returned. The encryption or decryption unit may also receive data from the non-volatile memory and send it to the interface. The invention improves on the prior art copy protection as a hacker must reverse engineer the game application in order to copy it, if the encryption unit is unknown. The invention also provides an optical medium equipped with a RFID circuit.

Abstract: A method for performing at least one evolution operation in a dynamic, evolutive community of devices in a network comprising at least a first device. The method comprises a step of sending at least one message over the network from the first device to a second device, wherein the first device continues the method without acknowledgement of the at least one message from the second device. The method is suitable for execution on clockless devices. A device for performing the method is also claimed.

Abstract: A cartridge preferably for use with a game console. The cartridge comprises a ROM, a non-volatile memory, a processor and a dispatcher. An application running on the console may communicate with the dispatcher using predefined addresses, which enables the dispatcher to access the ROM, the non-volatile memory, or the processor, as the case may be. The invention improves on the prior art copy protection as no generic copy method may be found if the addresses are changed from one cartridge to another. In addition, to copy the software, the processor must be emulated.

Abstract: The present invention relates to IP networks and, more particularly, local area networks, for example home networks. It concerns the manner in which devices connected to such networks obtain and update knowledge of the other compatible devices connected to the network. To do this, the invention is based on a finite-state machine, comprising connected, disconnected and standby states. The changes of state take place on receipt of messages, requests or replies from the other devices, or on expiry of timers in the absence of receipt of messages.

Abstract: The invention relates to the protection by firewall of a domestic community of interconnectable appliances. The invention allows distributed and totally decentralized management of the firewall policy, implemented at the level of each appliance, which is consistent and adapts dynamically to the changes occurring within the domestic network. We shall speak of ubiquitous firewalls.

Abstract: A method for discovering emulated clients. A verifier sends a cryptographic challenge C to a client and preferably starts a timer. The client uses a deterministic key search algorithm to find the correct key and returns the result as a number of tries needed. The verifier then stops the timer if this was started and verifies that the result is correct and preferably that the response was timely. Also provided is a verifier.

Abstract: The present invention concerns a method in a network comprising at least a first device and a second device, where the sending of a packet by two devices simultaneously generates a collision. The method comprises the steps of emitting by the first device a packet comprising a first part, and a second part comprising at least an identification of a source and a destination of the packet, receiving the first part of the packet by the second device; and in the case of the second device detecting a collision during the reception of the second part of the packet, issuing a packet indicating collision detection by the second device. The present invention also concerns a sending device and a receiving device implementing the method.

Abstract: The invention relates to a method for inserting a new device in a community of devices wherein each device of the community is able to store insertion requests received from at least one new device and to forward these insertion requests to a device chosen by a user of the community for confirming authorization to join the community.

Abstract: A new system for creating and updating a secure community of devices in digital networks is disclosed. A device adapted to belong to a community of networked devices contains; a provable identity and/or means for generating and/or obtaining a provable identity; means adapted to store information about devices of the community having trust relationships with the device; means adapted to store information about devices not trusted by this device; and means for trust relationships synchronization.

Abstract: The invention relates to the protection by firewall of a domestic community of interconnectable appliances. The invention allows distributed and totally decentralized management of the firewall policy, implemented at the level of each appliance, which is consistent and adapts dynamically to the changes occurring within the domestic network. We shall speak of ubiquitous firewalls.

Abstract: The present invention relates to IP networks and, more particularly, local area networks, for example home networks. It concerns the manner in which devices connected to such networks obtain and update knowledge of the other compatible devices connected to the network. This method is based on the regular transmission of signalling messages by all the compatible devices. Thus, by monitoring the network, a device is able to detect the other devices in the network.

Abstract: The present invention relates to IP networks and, more particularly, local area networks, for example home networks. It concerns the manner in which devices connected to such networks obtain and update knowledge of the other compatible devices connected to the network. To do this, the invention is based on a finite-state machine, comprising connected, disconnected and standby states. The changes of state take place on receipt of messages, requests or replies from the other devices, or on expiry of timers in the absence of receipt of messages.