Methods and devices for protecting a stream of packets

A filtering method comprising:

• filtering at least one packet in a network composed of router nodes routing packets including a first router node, transmitter nodes transmitting packets including a first transmitter node, and receiver nodes receiving packets including a first receiver node connected to the first router node, the filtering being implemented by the first router node and comprising:
• receiving a message comprising an expected value of a protection parameter from a device associated with the first receiver node;
• receiving said at least one packet from the first transmitter node, said at least one packet being destined for said first receiver node and comprising said protection parameter;
• filtering said at least one packet when a value of said protection parameter does not correspond to said expected value;
• after expiration of a defined period since receiving said message, receiving a new message from said device associated with the first receiver node comprising a new expected value of the protection parameter;
• and
• filtering at least one new packet received from the first transmitter node and destined for said first receiver node when said new value of said protection parameter does not correspond to said new expected value.

A device for protecting at least one packet in a network composed of router nodes routing packets including a first router node, transmitter nodes transmitting packets, and receiver nodes receiving packets including a first receiver node connected to the first router node, the device being associated with the first receiver node and comprising:

• a receiver;
• a transmitter;
• at least one processor;
• and
• at least one memory coupled to the at least one processor with instructions stored thereon which when executed by the at least one processor implement a method comprising:
• transmitting a message comprising an expected value of a protection parameter destined for the first router node, the first router node processing routing of said at least one packet destined for the first receiver node based on said expected value of said protection parameter being contained in at least one field of said at least one packet;
• and
• after expiration of a defined period since transmitting the message, transmitting a new message with a new value of the protection parameter.

A device for filtering at least one packet in a network composed of router nodes routing packets including a first router node, transmitter nodes transmitting packets including a first transmitter node, and receiver nodes receiving packets including a first receiver node connected to the first router node, the device being implemented in the first router node and comprising:

• a receiver;
• a transmitter;
• at least one processor;
• and
• at least one memory coupled to the at least one processor with instructions stored thereon which when executed by the at least one processor implement a method comprising:
• receiving a message comprising an expected value of a protection parameter from a device associated with the first receiver node;
• receiving said at least one packet from the first transmitter node, said at least one packet being destined for said first receiver node and comprising said protection parameter;
• filtering said at least one packet when a value of said protection parameter does not correspond to said expected value;
• after expiration of a defined period since receiving said message, receiving a new message from said device associated with the first receiver node comprising a new expected value of the protection parameter;
• and
• filtering at least one new packet received from the first transmitter node and destined for said first receiver node when said new value of said protection parameter does not correspond to said new expected value.

At least one non-transitory computer readable information medium comprising instructions stored thereon which when executed by at least one processor of a protection device associated with a first receiver node implement a protection method comprising:

• protecting at least one packet in a network composed of router nodes routing packets including a first router node connected to the first receiver node, transmitter nodes transmitting packets, and receiver nodes receiving packets including the first receiver node, the protecting comprising:
• transmitting a message comprising multiple expected values of a protection parameter destined for the first router node, each expected value corresponding to a different period of use, the first router node processing routing of said at least one packet destined for the first receiver node based on one said expected values of said protection parameter being contained in at least one field of said at least one packet;
• and
• after expiration of a defined period since transmitting the message, transmitting a new message with a new value of the protection parameter.