System and method of per-packet keying

H - Electricity – 04 – L

Patent

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H04L 9/14 (2006.01) H04L 9/28 (2006.01)

Patent

CA 2690755

A method of per-packet keying for encrypting and decrypting data transferred between two or more parties, each party having knowledge of a shared key that allows a per-packet key to differ for each packet is provided. Avoiding the use of a static session key during encryption offers several advantages over existing encryption methods. For example, rejecting packets received with duplicate sequence numbers, or sequence numbers that are beyond a specified deviation range mitigates Replay Attacks.

L'invention porte sur un procédé de calcul de clé par paquet pour chiffrer et déchiffrer des données transférées entre deux parties ou plus, chaque partie ayant une connaissance d'une clé partagée qui permet à une clé par paquet d'être différente pour chaque paquet. Le fait d'éviter l'utilisation d'une clé de session statique pendant le chiffrage offre plusieurs avantages sur des procédés de chiffrage existants. Par exemple, le rejet de paquets reçus avec des numéros de séquence en double, ou des numéros de séquence qui sont au-delà d'une plage d'écart spécifiée limitent les attaques par réexécution.

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