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Tile map encryption and decryption method

An encryption and decryption, tile map technology, applied to encryption devices with shift registers/memory, key distribution, can solve the problem of unusable stolen information

Inactive Publication Date: 2020-02-28
CHINA CHANGFENG SCI TECH IND GROUPCORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Digital watermarking technology is one of the effective ways to solve the copyright problem of electronic maps. However, adding digital watermarks to electronic maps is only a passive defense strategy. It can only be tracked and confirmed after the information is stolen, and it cannot actively encrypt the stolen information. unavailable

Method used

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  • Tile map encryption and decryption method
  • Tile map encryption and decryption method

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Experimental program
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Embodiment Construction

[0018] The encryption methods used by the invention for mobile map tiles are mainly scrambling and bit XOR encryption. Encryption methods such as figure 1 As shown, the specific steps are as follows:

[0019] (1) Randomly scramble the storage order of the tiles, and assign the order value to the ID.

[0020] (2) Use the layer value (LV), row value (Row) and column value (Col) of the tile to perform operations and combinations. The formula (LV2×Row)^Col is carried out, and the obtained operation value is used as the input of the pseudo-random number generator to generate a random number, and the LV, Row, and Col are respectively encrypted by a bit XOR operation to generate LV', Row' and Col'.

[0021] (3) Create a table in the database and put the tiles into storage.

[0022] Through the above 3 steps, the encryption of the map tile package on the mobile terminal is completed. When using the tile service or offline package illegally, the order of the tiles in SQLite has be...

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Abstract

The invention provides a tile map encryption and decryption method which comprises the following steps: during encryption, randomly scrambling a storage sequence of tiles, and endowing a sequence value on an ID; carrying out operation combination by using the layer value LV, the row value Row and the column value Col of the tile to generate a random number, respectively carrying out bitwise exclusive-OR operation encryption on the LV, the Row and the Col to generate LV ', Row' and Col ', establishing a table in a database, and storing the tile in the database; and during decryption, combiningcalculation formulas consistent with the encryption mode, adopting the same pseudo random number generator, obtaining LV ', Row' and Col 'through bit exclusive-OR operation, querying the SQLite database, and obtaining tile contents at actual LV, Row and Col positions. The method is used for protecting the geographic information of the mobile terminal, and ensures that the map information is not stolen by others while bringing convenience to users.

Description

technical field [0001] The invention relates to the technical field of electronic maps, and relates to a method for encrypting and decrypting electronic maps to prevent the electronic maps from being illegally copied. Background technique [0002] In the Internet era, geographic information is an important strategic resource of the country, whether it is in government management decision-making, national economic construction, or in people's lives, it plays a pivotal role. At the same time, with the development of intelligence, mobile terminals are also playing an increasingly important role in people's life and work, which promotes the development of mobile map applications. Nowadays, mobile map applications provide corresponding functions for many services related to geographical location information in daily life and work, and map applications on mobile terminals have been integrated into people's lives and even work. However, due to the form in which electronic map info...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/10H04L9/06H04L9/08
CPCG06F21/10H04L9/0662H04L9/0869G06F21/107
Inventor 张超赵凯
Owner CHINA CHANGFENG SCI TECH IND GROUPCORP