LIFM algorithm for security association database lookup in IPSEC application
US7100043B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2002 |
| Grant date | Aug 29, 2006 |
| Priority date | — |
| Expiry date | May 4, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L63/164
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Current applications used in security system for encryption/decryption/authentication require intense CPU computation for an SAD search. Therefore, a part of the SAD is planted into an ASIC in order to lessen the load of the CPU.The invention provides a high-performance lookup method that is “LIFM” adapted to the ASIC. Initially, the ASIC makes a perfect match by comparing the SAD_index field of all items allocated in the ASIC with an incoming packet to fetch the required SAD_key. If there is no match, the software and hardware are started by issuing an interrupt from the ASIC until the CPU finds a perfectly matched item. Then, the software level updates the perfectly matched item in the ASIC.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.