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Abstract

A technique that partially encrypts tokenized documents is disclosed. An electronic document image is generated from the document. A plurality of tokens are stored as a dictionary, wherein the tokens represent shapes contained in the document. A plurality of triples comprising a token identification (ID) and a corresponding position are generated from the document image, such that the token ID identifies a token from the dictionary that corresponds to a shape in the document image at the corresponding position. The token IDs are encrypted. The output representation for the secured document comprises encrypted token IDs, positions and a dictionary of tokens. Encoding techniques that reduce the size of the secured document are also disclosed. A trusted image output terminal, for use in document reconstruction, includes a single integrated circuit that performs the decrypting function and the page rendering function to significantly reduce the ability to capture the electronic document in the clear.

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First Claim