Cryptography – Particular algorithmic function encoding
Reexamination Certificate
2008-03-25
2008-03-25
Sheikh, Ayaz (Department: 2131)
Cryptography
Particular algorithmic function encoding
C380S028000, C380S256000, C380S277000, C380S284000, C398S071000, C713S160000
Reexamination Certificate
active
07349537
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.
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Boyd Edward W.
Davis Lawrence D.
Hirth Ryan E.
Ho Ngo Thahn
Kramer Glen
Chen Shin-Hon
Park Vaughan & Fleming LLP
Sheikh Ayaz
Teknovus, Inc.
Yao Shun
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