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Digital watermark implementation method based on time stamp

A technology of digital watermarking and implementation method, which is applied in electrical components, wireless communications, security devices, etc., can solve the problems of inability to short message sources and content authentication, and achieve the effect of reducing negative effects

Inactive Publication Date: 2015-08-19
NANJING INRICH TECH
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0007] In order to overcome the deficiency that the existing GSM mobile phone cannot authenticate the source and content of the short message, the present invention provides a digital watermarking method based on time stamp

Method used

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  • Digital watermark implementation method based on time stamp

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Embodiment Construction

[0015] exist figure 1 In the process, the sending mobile phone (2) sends the original short message (5) to the short message center (3), and the short message center (2) generates the original PDU, and calculates the 128bit digest sequence (6) according to TP-UD and TP-RA , and send the abstract and receiving mobile phone number (7) to the authentication center (1), the authentication center (1) calculates the 32bit signature sequence (8) and sends it to the short message center (3), the short message center (3) calculates Generate a digital signature and insert it into the PDU as a watermark, and send the watermarked short message (9) to the receiving mobile phone (4).

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Abstract

The invention discloses a digital watermark implementation method based on a time stamp, and a watermark embedding process comprises the following steps: a short message service center of a service provider employs a return address (TP-RA) and user information (TP-UD) to calculate RAND of a 128bit series through HUSH operation; an authentication center employs the RAND and the Ki of a target cellphone to calculate XRES of a 32bit series through an A3 algorithm; the short message service center employs the XRES to generate digital signatures with three intensities through unidirectional mapping operation; the short message service center enables the digital signatures to serve as watermarks inserted into the time stamp (TP-SCTS) of a PDU data package; and a receiving cellphone employs recognition software to detect the watermarks, and determines whether a short message is from the service operator or not. The method can guarantees the invisibility of the watermarks to a user, does not affect the contents of the short message, and can be directly used for a conventional GSM communication system.

Description

Technical field [0001] The invention relates to a method for realizing digital watermark based on time stamp, which is used for adding digital watermark in short message service of GSM system, especially a method for adding invisible digital watermark in GSM protocol data unit. Background technique [0002] Digital watermark (digital watermark) refers to the embedding of inconspicuous marks in the digital data content. Embedded tokens are usually invisible or imperceptible, but can be detected or extracted with some computational operations. [0003] GSM (Global System For Mobile Communication) is a standard introduced by the European Committee for Standardization in 1992. It adopts digital communication technology and unified network standards. Since GSM is the second generation of mobile communication technology compared to analog mobile communication technology, it is referred to as 2G. [0004] Short message (short message service), referred to as SMS. It is text or di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/14H04W12/02
CPCH04W4/14H04W12/02
Inventor 姚冰心吴斌
Owner NANJING INRICH TECH
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