Fast verification device for MAC (Message Authentication Code) of RSSP-II (Railway Signal Security Protocol-II) based on FPGAs (Field Programmable Gate Arrays)

Abstract

The invention relates to a fast verification method for an MAC (Message Authentication Code) of an RSSP-II (Railway Signal Security Protocol-II) based on FPGAs (Field Programmable Gate Arrays). The FPGA1 and FPGA2 are programmed with the following module through programming language hardware: a data interface module, an MAC scheduling module, a DES module and a dual-channel comparison module, wherein the DES module comprises a DES top module, a DES core module, a Key-schedule sub-key generation module and a crp single-round circulation module; the dual-channel comparison module is used for communication between the two FPGAs, forms a two-out-of-two structure, and sends a dual-channel comparison status flag to a CPU through the data interface module when the two FPGAs are inconsistent in result; and subsequent message transmission is carried out if it passes the dual-channel comparison, otherwise, the process enters an error processing program. The fast verification device adopts the design method of a finite state machine and an assembly line, fully takes the consumption of system resources into account on the basis of ensuring the processing speed and achieves the balance betweenspeed and area. The fast verification device effectively reduces the CPU resource occupation of the RSSP-II for high-speed railway train-ground wireless security communication, greatly improves the data throughout, shortens the train-ground authentication delay and has higher security and reliability.

Description

technical field [0001] The invention relates to the technical field of rail transit safety communication, in particular to a wireless communication system adapted to the communication process of a CTCS-3 (Chinese Train Control System-3) level train operation control system with strict requirements on safety and delay. Background technique [0002] In the CTCS-3 train control system, during the communication and interaction process between RBC (Radio Block Center) wireless block center and TSRS (Temporary Speed ​​Restriction Server) temporary speed limit server, RBC and RBC equipment, RBC equipment and vehicle system equipment, according to The RSSP-II (Railway Signal Security Protocol-II) railway signal security communication protocol stipulates that it needs to meet the security requirements for open network communication in EN50159-2. The two parties in the communication run the message source verification security program respectively in the MASL message authentication se...

AI Technical Summary

Problems solved by technology

The message verification code of the MASL layer uses the DES data encryption standard as the basic algorithm. During the generation process, multiple rounds of iterations and data processing are required, which consume a lot of system resources and take up processing time.

The CPU is the core computing unit. If too many resources are consumed in the process of MAC verification, it will hinder the improvement of the processing capability of the device.

[0005] (2) The processing efficiency of the software programming method is not high

It takes dozens of milliseconds or even longer to complete the message source verification process by using CPU programming, which limits the further shortening of the end-to-end communication delay between RBC and vehicle equipment

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