System for reading encrypted information, and unit for use in such a system
AssigneeTelub Teknik AB
InventorLars Jernbacker
Life of this patent
Estimating the term…
Abstract
A computer system for reading encrypted information is disclosed. A unit (24) for decrypting the information is open only as long as a display tool (A4) occupies a system-modal operative mode (SM). In this system-modal operative mode, the display tool (A4) emits, to the decrypting unit (24), a predetermined enabling signal (BS) without which the decrypting function does not work. When the display tool occupies the system-modal operative mode, the user does not have access to the user functions not defined by the display tool, thereby preventing unauthorized copying, storage and the like of the decrypted information.
Claims15
A computer system for managing encrypted information, said computer system comprising:
- a decrypting unit for receiving encrypted information and being operable in a converting state in which it converts said encrypted information into corresponding decrypted information, or in a non-converting state in which no decryption of said encrypted information is possible by said decrypting unit, said decryption unit being operable in the converting state only if it receives a predetermined external decryption key;
- and
- a display tool for displaying said decrypted information to a user;
- wherein said decrypting unit passes from the non-converting state to the converting state only upon receipt of a predetermined enabling signal in addition to the predetermined external key;
- wherein said display tool operates in a system-modal operative mode for displaying the decrypted information;
- and
- wherein the predetermined enabling signal being emitted from said display tool to said decrypting unit, however only if said display tool occupies the system-modal operative mode.
A decrypting unit for use in a computer system and for receiving encrypted information, said decryption unit being operable either in a converting state in which it converts said encrypted information into corresponding decrypted information, or in a non-converting state in which no decryption of said encrypted information is possible by said decryption unit, said decryption unit being operable in the converting state only if it receives a predetermined external decryption key, said decrypting unit being able to pass from the non-converting state to the converting state only if it receives a predetermined enabling signal in addition to the predetermined external key.
Dependencies are inferred from the claim text.