Method for data encryption in an ethernet passive optical...

Cryptography – Particular algorithmic function encoding

Reexamination Certificate

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Details

C380S028000, C380S256000, C380S277000, C380S284000, C398S071000, C713S160000

Reexamination Certificate

active

11078923

ABSTRACT:
One embodiment of the present invention provides a system that decrypts downstream data in an Ethernet passive optical network (EPON). During operation, the system receives a data frame which is encrypted based on a remote input block and a session key, wherein the remote input block is constructed based on a remote cipher counter and a remote block counter. The system adjusts a local cipher counter based on a received checksum located in a preamble of the data frame, wherein the local cipher counter is substantially synchronized with the remote cipher counter. In addition, the system truncates the local cipher counter by discarding n least significant bits thereof. The system then constructs a local input block based on the truncated cipher counter and a local block counter for the received data frame. Next, the system decrypts the data frame based on the local input block and the session key.

REFERENCES:
patent: 6870836 (2005-03-01), Dyke et al.
patent: 2004/0028409 (2004-02-01), Kim et al.
patent: 2004/0073788 (2004-04-01), Kim et al.
patent: 2004/0136534 (2004-07-01), Stiscia et al.
patent: 2004/0196862 (2004-10-01), Song et al.
patent: 2005/0008158 (2005-01-01), Huh et al.
patent: 2005/0047602 (2005-03-01), Lee et al.

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