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EP0500245A2
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EP
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Cipher communication system for transaction data
Assignee: Toshiba Corp
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Filing: 1992-02-07
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Granted: —
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Expires: 2012-02-07
Abstract
Abstract A cipher communication system for communicating transaction data between a host computer (1) and a portable electronic device (21), wherein the host computer (1) includes a first memory (3) for storing a master key data, a generator (40) for generating a transaction key data which is to be used for enciphering the transaction data, a data converter (7) for enciphering the transaction key data according to the master key data and a first interface (4) for transferring the transaction key data enciphered by the data converter (7), and wherein the portable electronic device (21) includes a second interface (24) for receiving the enciphered transaction key data transferred from the host computer (1), a second memory (231) for storing the master key data, a second data converter (25) for deciphering the enciphered transaction key data received by the second interface (24) and a third memory (232) for storing the transaction key data deciphered by the second data converter (25), and causing the stored transaction key to be erased on completion of the communication.
Inventors
- 👤 Yasuo c/o Intellectual Property Division Iijima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 23:56
CPC Classifications
G; G07; G07F; G07F7/00; G07F7/08; G07F7/10; G07F7/1008; G06; G06Q; G06Q20/00; G06Q20/30; G06Q20/34; G06Q20/341; G06Q20/36; G06Q20/367; G06Q20/38; G06Q20/382; G06Q20/3829; G06Q20/40; G06Q20/409; G06Q20/4097; G06Q20/40975; G07F7/1016; H; H04; H04L; H04L9/00; H04L9/08; H04L9/0816; H04L9/0819; H04L9/0822; H04L9/0894
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
162 words
A cipher communication system for communicating transaction data between a first electronic device and a second electronic device, characterised in that the first electronic device (1) comprises: first memory means (3) for storing a master key data; means (40) for generating a transaction key data which is to be used for enciphering the transaction data; means (2, 7) for enciphering the transaction key data in accordance with the master key data; and means (4) for transferring the enciphered transaction key data; and in that the second electronic device (21) comprises: means (24) for receiving the enciphered transaction key data transferred from the first electronic device; second memory means (231) for storing the master key data; means (22, 25) for deciphering the enciphered transaction key data received by the receiving means using the master key data; and third memory means (232) for storing the deciphered transaction key data, and causing the stored transaction key data to be eliminated on completion of the communication.
Claim 2
Dependent Claim
162 words
A cipher communication system for communicating transaction data between a first electronic device and a second electronic device, characterised in that the first electronic device (1) comprises: first memory means (3) for storing a master key data; means (40) for generating a transaction key data which is to be used for enciphering the transaction data; means (2, 7) for enciphering the transaction key data in accordance with the master key data; and means (4) for transferring the enciphered transaction key data; and in that the second electronic device (21) comprises: means (24) for receiving the enciphered transaction key data transferred from the first electronic device; second memory means (231) for storing the master key data; means (22, 25) for deciphering the enciphered transaction key data received by the receiving means using the master key data; and third memory means (232) for storing the deciphered transaction key data, and causing the stored transaction key data to be eliminated on completion of the communication.
Claim 3
Dependent Claim
31 words
A system as claimed in claim 1, further characterised in that the system includes: a terminal device (11) interposed between the first electronic device (1) and the second electronic device (21).
Claim 4
Dependent Claim
88 words
A system as claimed in claim 2, further characterised in that: the terminal device (11) includes means (42) for supplying power to the second electronic device (21) for activating the second electronic device; the second electronic device (21) includes means (42a) for receiving the power supplied from the terminal device (11); and the third memory means (232) of the second electronic device (21) includes a RAM whose memory is maintained by the power supplied from the terminal device (11), but is cleared on interruption of the power supply.
Claim 5
Dependent Claim
58 words
A system as claimed in claim 1, further characterised in that the second electronic device (21) further comprises: a non-volatile memory (231) for storing the transaction key data deciphered by the deciphering means (25); and means (22) for directing the deciphered transaction key data to be stored in the non-volatile memory (231) or the third memory means (232).
Claim 6
Dependent Claim
103 words
A system as claimed in claim 1, further characterised in that the first electronic device (1) comprises: means (4) for transferring information for controlling the location of storage of the transaction key data in the second memory means (231) or the third memory means (231) of the second electronic device (21), and in that the selecting means (22) of the second electronic device (21) controls the location of storage the transaction key data deciphered by the deciphering means (25) into the second memory means (231) or the third memory means (232), in response to the information transferred from the first electronic device (1).
Claim 7
Dependent Claim
134 words
A cipher communication system for communicating transaction data between a first electronic device and a second electronic device, characterised in that the first electronic device (1) comprises: means (40) for generating a transaction key data which is used for enciphering the transaction data; means (2, 7) for enciphering the transaction key data according to a master key; means (4) for transferring the enciphered transaction key data; and in that the second electronic device (21) comprises: means (24) for receiving the enciphered transaction key data transferred from the first electronic device (1); means (25) for deciphering the enciphered transaction key data; memory means (232) for storing the transaction key data deciphered by the deciphering means (25); and means (12) for clearing the transaction key data from the memory means (232) in response to a command.
Claim 8
Dependent Claim
134 words
A cipher communication system for communicating transaction data between a first electronic device and a second electronic device, characterised in that the first electronic device (1) comprises: means (40) for generating a transaction key data which is used for enciphering the transaction data; means (2, 7) for enciphering the transaction key data according to a master key; means (4) for transferring the enciphered transaction key data; and in that the second electronic device (21) comprises: means (24) for receiving the enciphered transaction key data transferred from the first electronic device (1); means (25) for deciphering the enciphered transaction key data; memory means (232) for storing the transaction key data deciphered by the deciphering means (25); and means (12) for clearing the transaction key data from the memory means (232) in response to a command.
References Cited (Backward Citations)
No citation records indexed.
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