Method for data encryption in an ethernet passive optical network
US7349537B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 2005 |
| Grant date | Mar 25, 2008 |
| Priority date | — |
| Expiry date | Jun 10, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0637
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.