Decryption of retransmitted data in an encrypted...

Details Decryption of retransmitted data in an encrypted... Decryption of retransmitted data in an encrypted...

H - Electricity

04

L

H04L 9/00 (2006.01) H04L 1/08 (2006.01) H04L 9/18 (2006.01) H04L 1/18 (2006.01)

Patent

CA 2226716

The method generally includes the steps of receiving (201) a message (100) comprising a message indicator (101) and a plurality of encrypted blocks (103 through 111). When at least one block of the plurality of encrypted blocks is received with error, a second message is transmitted (215), which second message requests a retransmission of the at least one block. Upon receiving the retransmission of the at least one block without error, a keystream is generated (219) from the message indicator and the at least one block is decrypted using the keystream.

Cette invention concerne un procédé qui, de manière générale, comprend les étapes suivantes. On reçoit (201) tout d'abord un message (100) qui comprend un indicateur (101) de message ainsi que plusieurs blocs cryptés (103 à 111). Lorsque l'un au moins des blocs cryptés est reçu avec une erreur, on transmet (215) un second message par lequel on demande une retransmission de ce bloc. Une fois que ce bloc est retransmis et reçu sans erreur, une séquence de clé est générée (219) à partir de l'indicateur de message, et le bloc est ensuite décrypté à l'aide de cette séquence de clé.

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