Method for embedding and extracting text into/from electronic documents
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United States of America Patent
Stats
-
Sep 6, 2005
Grant Date -
May 29, 2003
app pub date -
Nov 2, 2001
filing date -
Nov 2, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention relates to a method and apparatus for authenticating various types of digital certificates by using a text embedding method. The execution of the present invention is divided into two case, one case including images in the certificate and another case not including the images in the certificate, according to the characteristics of the certificate. In the former case, a text embedding method is applied to images included in the certificate to embed a series of information text (a specific number of the certificate, and issuing organization, name of a person in charge, etc.) designated by a person who issues the certificate into the images. In the latter case, there is generated an image imperceptible to the human eve but having the same color as the ground color certificate.
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