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A method for improving serial data security and its olt device

A serial port data and equipment technology, applied in the field of serial port information security, can solve serial port data protection, security risks and other issues, and achieve the effect of improving security and data security

Active Publication Date: 2022-07-26
广州芯德通信科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the R&D personnel of the original factory often need the log information printed by the serial port for debugging and troubleshooting, most of the equipment manufacturers currently on the market do not protect the data of the serial port, which poses a great security risk

Method used

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  • A method for improving serial data security and its olt device
  • A method for improving serial data security and its olt device
  • A method for improving serial data security and its olt device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] like figure 1 As shown, a method for improving serial port data, the required CPLD functions and specific operation steps. The CPU of the OLT closes the echo, the PC can send data to the CPU normally, and the CPU can receive it. The data sent by the CPU passes through the CPLD and is coded by the truth table set within it, but whether the data sent by the CPU can finally reach the PC is controlled by the switch in the CPLD. Only when the PC inputs a specific instruction to the CPU, the instruction is recognized by the sequence detector in the CPLD at the same time, and the switch is closed, so that the data sent by the CPU can be received by the PC normally. Table 1 shows the serial port frame format of the CPU of the OLT device. The data bits are 8 bits, parity is not used, the stop bits are 1 bit, and the baud rate is 115200.

[0035] Table 1

[0036]

[0037] Table 2 is the truth table correspondence of CPLD internal processing data.

[0038] Table 2

[0039]...

Embodiment 2

[0050] Based on the method described in Embodiment 1, this embodiment also provides an OLT device, such as figure 2 As shown, it includes CPU and CPLD; the CPLD module includes an encoder, a switch, a sequence detector, a shift register FIFO1, and a comparison module;

[0051] When the OLT device is powered on, the CPLD enters the switch-on state by default;

[0052] The described sequence detector is used to monitor the instruction data transmitted from the PC to the CPU;

[0053] The shift register FIFO1 is used for registering the received instruction data according to the standard serial port protocol;

[0054] The described comparison module is used to compare the instruction data stored in the shift register FIFO1 with the start switch password oolt and the closed switch password colt set by the sequence detector respectively;

[0055] The switch is used for judging whether to start according to the comparison result, so as to realize whether the data sent by the CPU ...

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PUM

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Abstract

The invention discloses a method for improving serial port data security and an OLT device thereof, wherein the method comprises the following steps: S1: the OLT device is powered on, and the CPLD enters the switch-on state by default; S2: the sequence detector of the CPLD monitors the data transmitted from the PC to the CPU. Command data, according to the standard serial port protocol, CPLD stores the received command data into the shift register FIFO1; S3: The command data stored in the shift register FIFO1 is respectively matched with the start switch password oolt and the closed switch password colt set by the sequence detector. Compare; S4: If the command is the password to start the switch, keep the data state sent by the CPLD to disconnect the CPU; if the command is the password to close the switch, go to step S5; if the command is not to start the switch or the password to close the switch, return to S2 to continue Detection; S5: Close the switch, and the CPLD starts the encoder, and encodes the data sent by the CPU once; S6: Extracts the 8-bit data bits from the encoded data, and performs the second encoding according to the preset encoding truth table. The code is then sent to the PC through the switch.

Description

technical field [0001] The invention relates to the technical field of serial port information security, and more particularly, to a method for improving serial port data security and an OLT device thereof. Background technique [0002] At present, traditional OLT devices use serial ports (universal asynchronous transceivers) to communicate with PCs, and display the printing information of the CPU on the PC screen. The PC sends instructions to the embedded device through the serial port debugging software, so as to configure or debug its function, such as Chinese Patent Publication No.: CN 104461805 A, Publication Date: 2015.03.25, a CPLD-based system state detection method, which It is characterized in that each signal line that can reflect the abnormal state of the system is connected to the complex programmable logic device CPLD, and the prompt information corresponding to the abnormal state of the signal output by each signal line is set. signal; the CPLD detects the st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F11/22G06F11/30G06F13/42
CPCG06F11/2236G06F11/3024G06F13/4282
Inventor 饶东盛梁文艺徐培根
Owner 广州芯德通信科技股份有限公司