Patent Document ID: 8402371
Application ID: 12933207

Base Claim:
1. A method for embedding covert data in a text document, the method comprising: providing the document with multiple characters that include a first character that occurs in first and second occurrences; analyzing a frequency of the multiple characters; selecting the first character from the multiple characters in response to the first character occurring most frequently in the multiple characters; selecting the first occurrence of the first character as a reference character and the second occurrence of the first character as a rotatable character; altering a rotational orientation of the rotatable character to produce an altered character with a predetermined rotation with respect to the reference character, wherein the rotation represents the embedded covert data; and formatting the document to produce a formatted document based on the altered character.

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Claim 4:
4. A method as claimed in claim 1 , further comprising: providing the document with additional occurrences of the first character, wherein the second and additional occurrences of the first character constitute all remaining occurrences of the first character in the document beyond the first occurrence of the first character; selecting the remaining occurrences of the first character as rotatable characters; altering a rotational orientation of the rotatable characters to produce altered characters with the rotation with respect to the reference characters, wherein the rotation represents the embedded covert data; and formatting the document to produce a formatted document based on the altered characters.