EP0544528A1
Expired / Lapsed
EP
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A secret information protection system
Assignee: Fujitsu Ltd
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Filing: 1992-11-26
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Granted: —
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Expires: 2012-11-26
Abstract
Abstract A secret information protection system in an information processing system according to the present invention enables prevention of access to secret information by an unauthorized person, and includes; a storage unit (10) for storing secret information to be protected from an unauthorized person; an erasure instructing unit (14) for generating an erasing instruction, and the erasure instructing unit (14) preferably consisting of a switch unit operated by an authorized person or by a cover of the information processing system for generating an ON/OFF signal as the erasing instruction to erase the secret information from the storage unit (10); and an erasure unit (16) operatively connected to the storage unit (10) for erasing the secret information in accordance with the erasing instruction from the erasure instructing unit (14).
Inventors
- 👤 Masayuki c/o Fujitsu Limited Sonobe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 08:56
CPC Classifications
G; G06; G06F; G06F21/00; G06F21/70; G06F21/86; G06F2221/00; G06F2221/21; G06F2221/2143
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
94 words
A secret information protection system in an information processing system, comprising, a storage means for storing secret information to be protected from an unauthorized person, a erasure instructing means for generating an erasing instruction, and the erasure instructing means preferably consisting of a switch means operated by an authorized person for generating an ON/OFF signal as the erasing instruction to erase the secret information from the storage means, and an erasure means operatively connected to the storage means for erasing the secret information in accordance with the erasing instruction from the erasure instructing means.
Claim 2
Dependent Claim
109 words
A secret information protection system in an information processing system, comprising, a storage means for storing secret information to be protected from an unauthorized person, an erasure instructing means for generating an erasing instruction, and the erasure instructing means preferably consisting of a cover switch operated in accordance with an opening/closing operation of a cover of the information processing system for generating an ON/OFF signal as the erasing instruction to erase the secret information from the storage means when the cover is closed, and an erasure means operatively connected to the storage means for erasing the secret information in accordance with the erasing instruction from the erasure instructing means.
Claim 3
Dependent Claim
78 words
A secret information protection system in an information prossing system, comprising, a storage means for storing secret information to be protected from an unauthorized person, an erasure instructing means for generating an erasing instruction when it detects disconnection at a connection point for a power source of the secret information protection system, and an erasure means operatively connected to the storage means for erasing the secret information in accordance with the erasing instruction from the erasure instructing means.
Claim 4
Dependent Claim
81 words
A secret information protection system in an information processing system, comprising, a storage means for storing secret information to be protected from an unauthorized person, an erasure instructing means for generating an erasing instruction when it detects disconnection of a telephone line of the secret information protection system based on a change in voltage/current thereof, and an erasure means operatively connected to the storage means for erasing the secret information in accordance with the erasing instruction from the erasure instructing means.
Claim 5
Dependent Claim
78 words
A secret information protection system in an information processing system, comprising, a storage means for storing secret information to be protected from an unauthorized person, an erasure instructing means for generating an erasing instruction when it detects disconnection at a connection point for a telephone line of the secret information protection system, and an erasure means operatively connected to the storage means for erasing the secret information in accordance with the erasing instruction from the erasure instructing means.
Claim 6
Dependent Claim
81 words
A secret information protection system in an information processing system, comprising, a storage means for storing secret information to be protected from an unauthorized person, an erasure instructing means for generating an erasing instruction when it detects disconnection to a modem connected to the secret information protection system based on a change in voltage/current thereof, and an erasure means operatively connected to the storage means for erasing the secret information in accordance with the erasing instruction from the erasure instructing means.
Claim 7
Dependent Claim
78 words
A secret information protection system in an information processing system, comprising, a storage means for storing secret information to be protected from an unauthorized person, an erasure instructing means for generating an erasing instruction when it detects disconnection at a connection point for a modem connected to the secret information protection system, and an erasure means operatively connected to the storage means for erasing the secret information in accordance with the erasing instruction from the erasure instructing means.
Claim 8
Dependent Claim
83 words
A secret information protection system in an information processing system, comprising, a storage means for storing secret information to be protected from an unauthorized person, an erasure instructing means for generating a erasing instruction when it detects disconnection to a packet assembly/disassembly apparatus connected to the secret information protection system based on a change in voltage/current thereof, and an erasure means operatively connected to the storage means for erasing the secret information in accordance with the erasing instruction from the erasure instructing means.
Claim 9
Dependent Claim
80 words
A secret information protection system in an information processing system, comprising, a storage means for storing secret information to be protected from an unauthorized person, an erasure instructing means for generating an erasing instruction when it detects disconnection at a connection point for a packet assembly/disassembly apparatus connected to the secret information protection system, and an erasure means operatively connected to the storage means for erasing the secret information in accordance with the erasing instruction from the erasure instructing means.
Claim 10
Dependent Claim
81 words
A secret information protection system in an information processing system, comprising, a storage means for storing secret information to be protected from an unauthorized person, an erasure instructing means for generating an erasing instruction when it detects removal of an IC card from the secret information protection system based on a change in voltage/current thereof, and an erasure means operatively connected to the storage means for erasing the secret information in accordance with the erasing instruction from the erasure instructing means.
Claim 11
Dependent Claim
81 words
A secret information protection system in an information processing system, comprising, a storage means for storing secret information to be protected from an unauthorized person, an erasure instructing means for generating an erasing instruction when it detects removal of an IC card from the secret information protection system based on disconnection of a contact point, and an erasure means operatively connected to the storage means for erasing the secret information in accordance with the erasing instruction from the erasure instructing means.
Claim 12
Dependent Claim
106 words
A secret information protection system in an information processing system, comprising, a storage means for storing secret information to be protected from an unauthorized person, a protection means for setting prohibition of access to the secret information, a decision means operatively connected to the storage means for prohibiting the access to the secret information when the protection means sets prohibition of the access, and permitting the access to the secret information when the protection means releases prohibition of the access, and a confirmation means operatively connected to the protection means for releasing prohibition of the access for the protection means after confirmation of an authoraized person.
Claim 13
Dependent Claim
47 words
A secret information protection system as claimed in claim 12, wherein said protection means comprises a switch means to set prophibition of the access, and to switch to a protection state which disables write/read operation of the secret information when the unauthoraized person operates the switch means.
Claim 14
Dependent Claim
43 words
A secret information protection system as claimed in claim 12, wherein said protection means comprises a cover switch to set prohibition of access when the cover is closed, and to switch to a protection state which disables write/read operation of the secret information.
Claim 15
Dependent Claim
50 words
A secret information protection system as claimed in claim 12, wherein said protection means detects disconnection at a connection point for a power source of the secret information protection system, and it sets prohibition of access and switches to a protection state which disables write/read operation of the secret information.
Claim 16
Dependent Claim
52 words
A secret information protection system as claimed in claim 12, wherein said protection means detects disconnection of a telephone line of the secret information protection system based on a change in voltage/current thereof, and sets prohibition of access and switches to a protection state which disables write/read operation of the secret information.
Claim 17
Dependent Claim
43 words
A secret information protection system as claimed in claim 12, wherein said protection means detects disconnection at a connection point for the telephone line, and sets prohibition of access and switches to a protection state which disables write/read operation of the secret information.
Claim 18
Dependent Claim
51 words
A secret information protection system as claimed in claim 12, wherein said protection means detects disconnection to a modem connected to the secret information protection system based on change of voltage/current thereof, and sets prohibition of the access and switches to protection state which disables write/read operation of the secret information.
Claim 19
Dependent Claim
42 words
A secret information protection system as claimed in claim 12, wherein said protection means detects disconnection at a connection point for the modem, and sets prohibition of access and switches to a protection state which disables write/read operation of the secret information.
Claim 20
Dependent Claim
53 words
A secret information protection system as claimed in claim 12, wherein said protection means detects disconnection to a packet assembly/disassembly apparatus connected to the secret information protection system based on a change in voltage/current thereof, and sets prohibition of access and switches to protection state which disables write/read operation of the secret information.
Claim 21
Dependent Claim
45 words
A secret information protection system as claimed in claim 12, wherein said protection means detects disconnection at a connection point for the packet assembly/disassembly apparatus, and sets prohibition of the access and switches to a protection state which disables write/read operation of the secret information.
Claim 22
Dependent Claim
52 words
A secret information protection system as claimed in claim 12, wherein said protection means detects removal of an IC card from the secret information protection system based on a change in voltage/current thereof, and sets prohibition of the access and switches to protection state which disables write/read operation of the secret information.
Claim 23
Dependent Claim
53 words
A secret information protection system as claimed in claim 12, wherein said protection means detects removal of the IC card from the secret information protection system based on disconnection of a contact point, and sets prohibition of the access and switches to a protection state which disables write/read operation of the secret information.
Claim 24
Dependent Claim
51 words
A secret information protection system as claimed in claim 12, wherein said confirmation means release prohibition of the access for the protection means when the authorized person inserts a password or unlocks a key of the system, and switches to a non-protection state which enables write/read operation to the secret information.
Claim 25
Dependent Claim
74 words
A secret information protection system as claimed in claim 12, wherein said protection means comprises a switch means to set protection state for the secret information when it is turned on, a setting circuit operatively connected to the switch means to generate a setting signal, and a protection flip-flop circuit operatively connected to the setting circuit to generate a prohibiting signal to the decision means to prohibit an access request to the secret information.
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DE3347483A1
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EP0235615A2
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WO1989000520A1
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EP0373278A1
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