XOR ENCODED DOCUMENT FOR SECURE MESSAGE EXCHANGE

• US 20070223690A1
• Filed: 02/10/2006
• Published: 09/27/2007
• Est. Priority Date: 02/10/2006
• Status: Active Grant

• Current Assignee: Palo Alto Research Center, Inc. (Xerox Holdings Corp.)
• Original Assignee: Palo Alto Research Center, Inc. (Xerox Holdings Corp.)
• Inventors: Goldberg, David, Shrader, Eric, Golle, Philippe
• Granted Patent: US 7,792,291 B2
• Time in Patent Office: Days
• US Class Current: 380/55
• CPC Class Codes: B42D 15/025 with peel-away layer hiding information tickets for lottos or bingo games A63F3/065
• CPC Class Codes: G09C 5/00 Ciphering apparatus or methods not provided for in the preceding groups, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages

Abstract

An XOR (exclusive or) encoded document is disclosed for establishing a joint secret between two parties. Encoded on the document are one or more areas of XOR messages. Each area containing an XOR message hides from view on each side of the XOR encoded document a different message on either side of a transparent base layer. To uncover a message in an area containing an XOR message on one side of the transparent base layer, the message on the other side of the XOR encoded document is scratched off and rendered illegible.

Claims

1. An article of manufacture for secure message delivery, the article comprising:

a transparent base layer with a first side and a second side;

a first encoding layer bonded to the first side of the transparent base layer; and

a second encoding layer bonded to the second side of the transparent base layer in a location opposite the first encoding layer;

wherein the transparent base layer and its bonded first and second encoding layers define an XOR message area in which;

(a) the first encoding layer encodes a first message visible only from the second side of the transparent base layer and the second encoding layer encodes a second message visible only from the first side of the transparent base layer;

(b) one of the first and the second encoded messages is revealed when one of the first and second encoding layers is removed from the transparent base layer; and

(c) the other of the first and second encoded messages is rendered illegible after the one of the first and second encoding layers is removed from the transparent base layer.

2. The article of manufacture according to claim 1, wherein each encoding layer further comprises:

a transparent barrier layer bonded to the transparent base layer;

a message layer bonded to the transparent barrier layer; and

an opaque layer bonded to the message layer.

3. The article of manufacture according to claim 2, wherein the transparent barrier layer comprises a layer of varnish.

4. The article of manufacture according to claim 2, wherein the message layer comprises a message encoded using ink.

5. The article of manufacture according to claim 2, wherein the message layer comprises a layer of carbon paper comprising:

(i) a donor layer having a plurality of microcapsules containing an undeveloped dye and (ii) a receiving layer with dye developer that is in contact with to the donor layer;

wherein at least some of the plurality of microcapsules are broken to encode a message with developed dye.

6. The article of manufacture according to claim 2, wherein the opaque layer comprises a layer of latex.

7. The article of manufacture according to claim 2, further comprising a document having a plurality of XOR message areas arranged thereon.

8. The article of manufacture according to claim 7, wherein at least one XOR message area on the document comprises a tab that may be folded for viewing either the first encoding layer or the second encoding layer from one side of the document.

9. A method for secure message delivery, the method comprising:

providing a transparent base layer with a first side and a second side;

bonding a first encoding layer to the first side of the transparent base layer; and

bonding a second encoding layer to the second side of the transparent base layer in a location opposite the first encoding layer;

wherein the transparent base layer and its bonded first and second encoding layers define an XOR message area in which;

(a) the first encoding layer encodes a first message visible only from the second side of the transparent base layer and the second encoding layer encodes a second message visible only from the first side of the transparent base layer;

(b) one of the first and the second encoded messages is revealed when one of the first and second encoding layers is removed from the transparent base layer; and

(c) the other of the first and second encoded messages is rendered illegible after the one of the first and second encoding layers is removed from the transparent base layer.

10. The method according to claim 9, wherein bonding each encoding layer further comprises:

bonding a transparent barrier layer to the transparent base layer;

bonding a message layer to the transparent barrier layer; and

bonding an opaque layer to the message layer.

11. The method according to claim 10, further comprising forming the transparent barrier layer with a layer of varnish.

12. The method according to claim 10, further comprising forming the message layer with a message encoded using ink.

13. The method according to claim 10, further comprising forming the message layer with a layer of carbon paper comprising:

(i) a donor layer having a plurality of microcapsules containing an undeveloped dye and (ii) a receiving layer with dye developer that is in contact with to the donor layer;

wherein at least some of the plurality of microcapsules are broken to encode a message with developed dye.

14. The method according to claim 10, further comprising forming the opaque layer with a layer of latex.

15. The method according to claim 10, further comprising forming a document having a plurality of XOR message areas arranged thereon.

16. The method according to claim 15, wherein said forming forms at least one XOR message area on the document with a tab that may be folded for viewing either the first encoding layer or the second encoding layer from one side of the document.

17. The method according to claim 10, further comprising providing instructions for removing one of the first and second encoding layers from the transparent base layer.

18. The method according to claim 17, wherein the instructions permit a recipient to determine which of the one of the first and second encoding layers to remove from the transparent base layer.

19. The method according to claim 17, wherein the instructions specify for a recipient which of the one of the first and second encoding layers to remove from the transparent base layer.

20. An article of manufacture for secure message delivery, the article comprising:

a plurality of transparent base layers with a first side and a second side;

a first encoding layer bonded to the first side of each transparent base layer; and

a second encoding layer bonded to the second side of each transparent base layer;

wherein each transparent base layer and its bonded first and second encoding layers define an XOR message area in which;

(a) the first encoding layer encodes a first message visible only from the second side of the transparent base layer and the second encoding layer encodes a second message visible only from the first side of the transparent base layer;

(b) one of the first and the second encoded messages is revealed when one of the first and second encoding layers is removed from the transparent base layer; and

(c) the other of the first and second encoded messages is rendered illegible after the one of the first and second encoding layers is removed from the transparent base layer.