The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 01, 2008
Filed:
Oct. 01, 2004
Yong Dong Wu, Singapore, SG;
Huijie Robert Deng, Singapore, SG;
Yong Dong Wu, Singapore, SG;
Huijie Robert Deng, Singapore, SG;
Agency for Science, Technology and Research, Singapore, SG;
Abstract
A method of protecting an electronic document, the method comprising dividing an original document into data blocks; generating a corresponding hash value for each data block; generating a corresponding hash value for a group of data blocks (GOB); generating a hash tree structure based on the corresponding hash values for the data blocks and for the GOB; calculating a hash value of a root node of the hash tree structure, the root node having no parent in the hash tree structure; signing the hash value of the root node; and generating auxiliary authentication data; wherein said auxiliary authentication data enables authentication of portions of the electronic document based on a reconstruction of the hash tree structure.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile