An optical tag anti-counterfeiting method based on pseudo-random number stream cipher
A pseudo-random number and optical tag technology, applied in the field of optical communication, can solve problems such as counterfeit optical tags
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[0047] Example 1. User U consumes through optical tag L. Before consumption, the mobile phones of L and U have completed GPS-based time synchronization in the early stage, and the two are also installed with the same stream cipher generator. When U registers the business application of the service provider that provides L services, the stream cipher key Send to both parties in the form of digital integers; service data 010001010000101010... Encrypted by stream cipher to obtain encrypted data:
[0048] 001010101010010011…
[0049] The above data is displayed on L in a rolling cycle with a period of 2 seconds; U reads the above data through his mobile phone:
[0050] 001010101010010011…001010101010010011…001010101010010011…
[0051] Use the key stream to decrypt the above data to get the following data
[0052] 010001010000101010…010001010000101010…010001010000101010…
[0053] Through the search of the start bit identifier 010001, one cycle of data is obtained:
[0054] 0100...
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