Dynamic digital watermark
Some implementations may provide a computer-implemented method for validating a digital document, the method including: receiving, at a computing device, the digital document comprising at least two digital watermarks, the digital document issued by a central entity; retrieving a first digital watermark from the digital document, the first digital watermark visually presented at a first time point; retrieving a second digital watermark from the digital document, the second digital watermark visually presented at a second time point, the second digital watermark being different from the first digital watermark and the second time point being different from the first time point; and reading the digital document based on the retrieved first and second digital watermarks.
1. A computer-implemented method for reading a digital document, the method comprising:
receiving, at a computing device, the digital identification document comprising at least two digital watermarks, the digital identification document issued by a central entity;
retrieving a first digital watermark from the digital identification document, the first digital watermark visually presented at a first time point;
retrieving a second digital watermark from the digital identification document such that a sequence of digital watermarks is retrieved, the sequence comprising the first digital watermark and the second digital watermark, the second digital watermark visually presented at a second time point, the second digital watermark being different from the first digital watermark, the second time point being different from the first time point by an amount shorter than a retina dwell time.
2. The computer-implemented method of claim 1 , further comprising:
validating the digital identification document as authentic based on the first digital watermark, the second digital watermark, as well as a sequential order of the sequence of digital watermarks.
3. The computer-implemented method of claim 1 , comprising:
retrieving a sequence of digital watermarks comprising the first digital watermark, the second digital watermark, and a third digital watermark, the third digital watermark being different from the first digital watermark and the second digital watermark.
4. The computer-implemented method of claim 1 , further comprising:
analyzing the sequence of digital watermarks to confirm that the digital identification document is issued by the central entity.
5. The computer-implemented method of claim 1 , further comprising:
analyzing the sequence of digital watermarks to confirm that a person holding the digital identification document is the person identified by the sequence of digital watermarks.
6. The computer-implemented method of claim 1 , further comprising:
detecting a first temporal pattern in which the first digital watermark is visually presented intermittently.
7. The computer-implemented method of claim 6 , further comprising:
decoding, from the first temporal pattern, information linking an entity who has generated the digital identification document; and
determining whether the linked entity is the central entity.
8. The computer-implemented method of claim 6 , further comprising:
decoding, from the first temporal pattern, information linking a holder of the digital identification document; and
determining whether the linked holder is the person presenting the digital identification document.
9. The computer-implemented method of claim 1 , further comprising:
detecting a second temporal pattern in which the second digital watermark is visually presented intermittently.
10. The computer-implemented method of claim 9 , further comprising:
decoding, from the second temporal pattern, information linking an entity who has generated the digital identification document; and
determining whether the linked entity is the central entity.
11. The computer-implemented method of claim 9 , further comprising:
decoding, from the second temporal pattern, information linking a holder of the digital identification document; and
determining whether the linked holder is the person presenting the digital identification document.
12. The computer-implemented method of claim 1 , further comprising:
extracting information from the first digital watermark, the information correlatable with data encoded by the second digital watermark;
correlating the extracted information with data encoded by the second digital watermark; and
using results of the correlation to determine whether the digital identification document is authentic.
13. The computer-implemented method of claim 1 , further comprising:
extracting information from the second digital watermark, the information correlatable with data encoded by the first digital watermark;
correlating the extracted information with data encoded by the first digital watermark; and
using results of the correlation to determine whether the digital identification document is authentic.
14. A mobile computing device for authenticating a person, the mobile computing device comprising at least one processor configured to perform operations comprising:
receiving the digital identification document comprising at least two digital watermarks, the digital identification document issued by a central entity;
retrieving a first digital watermark from the digital identification document, the first digital watermark visually presented at a first time point;
retrieving a second digital watermark from the digital identification document such that a sequence of digital watermarks is retrieved, the sequence comprising the first digital watermark and the second digital watermark, the second digital watermark visually presented at a second time point, the second digital watermark being different from the first digital watermark, the second time point being different from the first time point by an amount shorter than a retina dwell time.
15. The mobile computing device of claim 14 , wherein the operations further comprise:
validating the digital identification document as authentic based on the first digital watermark, the second digital watermark, as well as a sequential order of the sequence of digital watermarks.
16. The mobile computing device of claim 14 , wherein the operations comprise:
retrieving a sequence of digital watermarks comprising the first digital watermark, the second digital watermark, and a third digital watermark, the third digital watermark being different from the first digital watermark and the second digital watermark.
17. The mobile computing device of claim 14 , wherein the operations further comprise:
analyzing the sequence of digital watermarks to confirm that the digital identification document is issued by the central entity.
18. The mobile computing device of claim 14 , wherein the operations further comprise:
analyzing the sequence of digital watermarks to confirm that a person holding the digital identification document is the person identified by the sequence of digital watermarks.
19. The mobile computing device of claim 14 , wherein the operations further comprise:
detecting a first temporal pattern in which the first digital watermark is visually presented intermittently.
20. The mobile computing device of claim 19 , wherein the operations further comprise:
decoding, from the first temporal pattern, information linking an entity who has generated the digital identification document; and
determining whether the linked entity is the central entity.
21. The mobile computing device of claim 19 , wherein the operations further comprise:
decoding, from the first temporal pattern, information linking a holder of the digital identification document; and
determining whether the linked holder is the person presenting the digital identification document.
22. The mobile computing device of claim 14 , wherein the operations further comprise:
detecting a second temporal pattern in which the second digital watermark is visually presented intermittently.
23. The mobile computing device of claim 22 , wherein the operations further comprise:
decoding, from the second temporal pattern, information linking an entity who has generated the digital identification document; and
determining whether the linked entity is the central entity.
24. The mobile computing device of claim 22 , wherein the operations further comprise:
decoding, from the second temporal pattern, information linking a holder of the digital identification document; and
determining whether the linked holder is the person presenting the digital identification document.
25. The mobile computing device of claim 14 , wherein the operations further comprise:
extracting information from the first digital watermark, the information correlatable with data encoded by the second digital watermark;
correlating the extracted information with data encoded by the second digital watermark; and
using results of the correlation to determine whether the digital identification document is authentic.
26. A non-transitory computer-readable medium, on which software instructions are stored, which instructions, when executed by a computer processor, cause the computer processor to perform the operations of:
receiving, at a computing device, the digital identification document comprising at least two digital watermarks, the digital identification document issued by a central entity;
retrieving a first digital watermark from the digital identification document, the first digital watermark visually presented at a first time point;
retrieving a second digital watermark from the digital identification document such that a sequence of digital watermarks is retrieved, the sequence comprising the first digital watermark and the second digital watermark, the second digital watermark visually presented at a second time point, the second digital watermark being different from the first digital watermark, the second time point being different from the first time point by an amount shorter than a retina dwell time.