Method and apparatus for encryption of over-the-air...

Details Method and apparatus for encryption of over-the-air... Method and apparatus for encryption of over-the-air...

H - Electricity

04

W

H04W 12/00 (2009.01) H04W 12/02 (2009.01)

Patent

CA 2580106

A communication device (202) converts a bit stream to multiple symbols and provides encryption at a physical layer by shifting a phase of each symbol of the multiple symbols to produce multiple encrypted symbols. Each encrypted symbol of the multiple encrypted symbols is modulated with an orthogonal (214) subcarrier to produce at least one modulated subcarrier and the at least one modulated subcarrier is then transmitted (278) via a wireless link. On a receive side (260), a receiving (260) communication device (250) receives the transmitted (230), encrypted symbols and provides decryption at a physical layer by shifting a phase of each encrypted symbol in correspondence with the phase (234) used to encrypt the symbol at the transmit side.

Dispositif de communication (202) convertissant un train de bits en de multiples symboles et assurant le cryptage au niveau d'une couche physique par déphasage d'une phase de chaque symbole de manière à obtenir de multiples symboles cryptés. Chaque symbole crypté parmi les multiples symboles cryptés et modulés avec une sous-porteuse orthogonale afin d'obtenir au moins une sous-porteuse modulée qui sera ensuite transmise par liaison sans fil. Sur un côté de réception, un dispositif de communication de réception (250) reçoit les symboles cryptés et transmis et assure le décryptage au niveau d'une couche physique par déphasage d'une phase de chaque symbole crypté en correspondance avec la phase utilisée pour cryptée le symbole au niveau du côté de la transmission.

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