Patent ID: 8150034

Claim:
A method for transmitting data from a first data processing device to a second data processing device, the first data processing device comprising a display device, wherein a) the second data processing device generates encrypted input instructions and transmits them to the first data processing device; b) the first data processing device displays the encrypted input instructions; c) the encrypted input instructions are decrypted by being viewed through an optical filter having a decryption pattern, wherein the decryption pattern comprises: i. areas which are designed in a way that the optical filter masks out said areas, and ii. a plurality of use areas embedded therein, said use areas being designed in a way that symbols for input instructions can be displayed, the size and shape of each use area constituting a secret of said decryption pattern, wherein the decryption pattern, in said use areas, contains a binary image pattern, the binary coding of which constitutes a secret of the decryption pattern; d) the second processing device generates the encrypted input instructions in a way that i. for said areas of the decryption pattern which are designed in a way that the optical filter masks out said areas, a binary image pattern with binary-coded, random noise is generated, wherein for each input instruction, the random noise is newly generated for those areas that are not used for decryption, ii. and for said use areas in which the decryption pattern contains a binary image pattern, a binary image pattern complementary or identical to the decryption pattern is generated, and iii. at those pixels of said complementary or identical image pattern that shall represent the input instructions, the pixel state is reversed so that they match the corresponding pixels of the decryption pattern or are complementary thereto; and e) the data to be transmitted are input into the first data processing device using the input instructions that have been decrypted by the optical filter and are transmitted to the second data processing device.