Patent ID: 8488204

Claim:
A data encryption method implemented on a pattern displaying medium with at least two types of ink comprising: marking a plurality of coordinate dots on the pattern displaying medium with a first type of ink, comprising marking the plurality of coordinate dots with the first type of ink on a two-dimensional surface of the pattern displaying medium by taking part of the plurality of coordinate dots as a header of a data block so as to indicate boundaries or locality of the data block, wherein any one of the taken part of the plurality of coordinate dots is not marked with a related data dot around, and each coordinate, which is other than any one of the taken part of the plurality of coordinate dots, in the data block is marked with a related data dot around, the first type of ink absorbing a first invisible light; encrypting plaintext data into a plurality of data dots, wherein the plurality of data dots are not used as part of a dot matrix for physically forming one or more alphanumeric characters with the data dots; and marking the plurality of data dots on the pattern displaying medium with a second type of ink according to positions of the plurality of marked coordinate dots, wherein the first type of ink is not used for marking the plurality of data dots on the pattern displaying medium and the second type of ink absorbing a second invisible light; wherein the first invisible light is different from the second invisible light; wherein when the pattern displaying medium is illuminated by the first invisible light, the first invisible light is reflected from the pattern displaying medium, the first invisible light is sensed by a first invisible light image sensor, and the coordinate dots absorbing the first invisible light are sensed by the first invisible light image sensor, and when the pattern displaying medium is illuminated by the second invisible light, the second invisible light is reflected from the pattern displaying medium, the second invisible light is sensed by a second invisible light image sensor, and the data dots absorbing the second invisible light are sensed by the second invisible light image sensor.