Patents by Inventor CHE WEI LEE

CHE WEI LEE has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for embedding secret message into PNG image
    Patent number: 8949610
    Abstract: A method for embedding a secret message into a PNG image comprises steps: converting a secret message into a plurality of secret codes; converting the secret codes into a plurality of secret shares; using a mapping process to modify values of the secret shares to approach a full-transparent value of an alpha channel of a PNG image, and sequentially embedding the mapped secret shares into the alpha channel. As the secret shares with high-transparent values, they leave the RGB channels untouched. Thus, embedding the secret shares into the PNG image does not make difference in the appearances between the secret-carrying image and the original PNG image. Therefore, the present invention can transmit secret message securely and realize covert communication.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: February 3, 2015
    Assignee: National Chiao Tung University
    Inventors: Che Wei Lee, Wen-Hsiang Tsai
  • METHOD FOR EMBEDDING SECRET MESSAGE INTO PNG IMAGE
    Publication number: 20110249813
    Abstract: A method for embedding a secret message into a PNG image comprises steps: converting a secret message into a plurality of secret codes; converting the secret codes into a plurality of secret shares; using a mapping process to modify values of the secret shares to approach a full-transparent value of an alpha channel of a PNG image, and sequentially embedding the mapped secret shares into the alpha channel. As the secret shares with high-transparent values, they leave the RGB channels untouched. Thus, embedding the secret shares into the PNG image does not make difference in the appearances between the secret-carrying image and the original PNG image. Therefore, the present invention can transmit secret message securely and realize covert communication.
    Type: Application
    Filed: February 23, 2011
    Publication date: October 13, 2011
    Applicant: NATIONAL CHIAO TUNG UNIVERSITY
    Inventors: CHE WEI LEE, WEN-HSIANG TSAI