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Electronic Stamp for Document Security in a Communication System

IP.com Disclosure Number: IPCOM000060842D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 14K

Publishing Venue

IBM

Related People

Huang, KT: AUTHOR [+3]

Abstract

The present invention relates to an electronic stamp used for authentication purposes in a communication system. The electronic stamp (ES) is placed on a document access to which is enabled by authentication. According to the invention, each document is considered to have an owner (i.e., a user holding the document) and each electronic stamp has a single owner and a single holder who may or may not be the owner of the electronic stamp. A stamp definition ES file defines the parameters (e.g., size, shape, etc.) that characterize the display image of the electronic stamp. The system has an ES directory of electronic stamps and assures that each electronic stamp is unique -- enabling only one user (the holder) to employ a particular stamp at any given time. The ES directory has access constraint for ES files and has an ES log.

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Electronic Stamp for Document Security in a Communication System

The present invention relates to an electronic stamp used for authentication purposes in a communication system. The electronic stamp (ES) is placed on a document access to which is enabled by authentication. According to the invention, each document is considered to have an owner (i.e., a user holding the document) and each electronic stamp has a single owner and a single holder who may or may not be the owner of the electronic stamp. A stamp definition ES file defines the parameters (e.g., size, shape, etc.) that characterize the display image of the electronic stamp. The system has an ES directory of electronic stamps and assures that each electronic stamp is unique -- enabling only one user (the holder) to employ a particular stamp at any given time. The ES directory has access constraint for ES files and has an ES log. In accordance with the invention, an electronic stamp has the following properties: 1. Each electronic stamp is assigned to a single user called the owner of the electronic stamp. The ownership of an electronic stamp is permanent in the sense that even if the electronic stamp is given to others to use, the owner-electronic stamp relationship does not change. Various operations on the electronic stamp can be performed by only the owner of the stamp. 2. An owner can transfer the access right to an electronic stamp to others. The user who has the access right of the electronic stamp is called the holder of the electronic stamp. To maintain the uniqueness of access, the owner loses accessibility to the electronic stamp after the electronic stamp is transferred to another. The holder of an electronic stamp can also pass it to others. 3. The owner can destroy an electronic stamp with a DESTROYSTAMP command when the electronic stamp is lost or the owner decides to terminate the use of the electronic stamp. 4. An electronic stamp may be stamped at any location on the document by a PLACESTAMP command. A document with a valid electronic stamp is assumed to be reliable. 5. After an electronic stamp is placed on a document, the document cannot be modified without removing the corresponding electronic stamp or electronic stamps from the area to be modified. After the document is modified, if a removed electronic stamp is to be again placed thereon, the document is sent back to the holder of the electronic stamp. 6. An electronic stamp on a document cannot be copied. To copy a stamped document, the system will create a copy of the document with a virtual stamp thereon and the document is tagged b...