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Security is a critical concern that must be addressed in the context of the electric power metering internet of things （IoT）. In order to achieve complete isolation between data stored in the public cloud （external network）and data stored in the private cloud （internal network），while enabling unidirectional communication from the external network to the internal network，a non-electric communication method based on encrypted QR codes was proposed. The method involved the generation of colored QR codes containing metering inspection information on the external network side. Data from the external network was transmitted unidirectionally to the internal network via these colored QR codes，with no electrical connection between the internal and external networks. To enhance security，a color/information hybrid encryption method was employed. The original inspection information was encrypted using the SM4 algorithm to generate monochrome QR codes. Subsequently，the monochrome QR codes were further encrypted using different colors by DNA and chaos，leveraging the rich color gamut of the display monitor. Experimental results demonstrate 100% accuracy in encryption and decryption，encryption and decryption computational speeds of less than 0.058 7 s，and linearly increasing time consumption. This method exhibits high accuracy and speed，meeting the requirements of electric power metering IoT systems in terms of transmission rate，security and reliability.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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