Patent ID: 8707047
Filing Date: 2014-04-22
Classification: H04L

Abstract:
1. A computer implemented method comprising: generating a first signature of data for a document using a processor based on a document that has a first document encoding for verifying that content of the document in the first document encoding is unchanged since generating the first signature of data; converting the document that has the first document encoding to a second document encoding, wherein the first document encoding and the second document encoding are different document encodings of the document; generating a second signature of data for the document based on the second document encoding for verifying that content of the document in the second document encoding is unchanged since generating the second signature of data; and including both the first signature of data and the second signature of data as a multiple encoding signature provided with the document to provide a digitally signed document such that the document can be verified whether the document is represented as the first document encoding using the first signature of data or the second document encoding using the second signature of data.