Patent US3884435A successfully refreshed from Google Patents.
Patent EP0458306A2 successfully refreshed from Google Patents.
EP0458306A2
Expired / Lapsed
EP
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Portable medium and information processing apparatus
Assignee: Toshiba Corp
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Filing: 1991-05-22
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Granted: —
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Expires: 2011-05-22
Abstract
Abstract An IC card (1; 20) having a control element, memory element and other necessary components is designed to have the individual components incorporated in a multi-layered integrated circuit, with the topmost layer constituted by an analyzable element (15; 35). This design prevents the functions of the incorporated integrated circuit from being optically analyzed, thus improving the information security of the IC card (1; 20). An information processing apparatus according to the present invention executes encryption of input information and decryption of read-out information in an IC card (1; 20). This allows the same information processing apparatus to perform information encryption of different systems for different information recording media (43). Accordingly, even if a third party finds out the decryption system for or one recording medium (43), he cannot immediately decrypt information on other recording media (43), which has been recorded by the same information processing apparatus. This design is therefore effective in inhibiting the third party from reading out information stored on information recording media (43).
Inventors
- 👤 Katsuhisa c/o Intellectual Property Div Hirokawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 15:26
CPC Classifications
G; G07; G07F; G07F7/00; G07F7/08; G07F7/10; G07F7/1008; G06; G06K; G06K21/00; G06K19/00; G06K19/06; G06K19/067; G06K19/07; G06K19/073; G06K19/07309; G06K19/07372; G06Q; G06Q20/00; G06Q20/30; G06Q20/34; G06Q20/341; G06Q20/38; G06Q20/40; G06Q20/409; G06Q20/4097; G06Q20/40975; G07F7/0806; G07F7/0813; G07F7/082; H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/087
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
A portable medium (3; 23) including an integrated circuit having individual means integrally formed in a multi-layered structure on a single chip, characterized by comprising: means (14; 34) for storing secret information; control means (11, 12, 13; 31, 32, 33), connected to said storing means, for processing said secret information and exchanging information with an external unit; and first means (15; 35), located on a topmost layer of said multi-layered structure, for protecting said information stored in said storing means whose content is unanalyzable upon analysis.
Claim 2
Dependent Claim
27 words
A portable medium (3; 23) according to claim 1, characterized by further comprising interface means, provided on said topmost layer, for exchanging information with said external unit.
Claim 3
Dependent Claim
83 words
A portable medium (3; 23) including an integrated circuit having individual means integrally formed in a multi-layered structure on a single chip, characterized by comprising: an EEPROM (15; 35) for storing input information; a ROM (14; 34) for storing secret data and a program necessary for a control operation, said ROM (14; 34) underlying a second layer in said multi-layered structure; and a CPU (11, 31) for performing general control of said portable medium (3; 23) and exchanging information with an external unit.
Claim 4
Dependent Claim
28 words
A portable medium according to claim 1, characterized in that said storing means (14; 34) includes means for storing information to be used for encryption/decryption of input information.
Claim 5
Dependent Claim
37 words
A portable medium according to claim 4, characterized in that said control means (11, 12, 13; 31, 32, 33) includes means for performing encryption/decryption of said input information according to said information stored in said storing means.
Claim 6
Dependent Claim
107 words
A portable medium (3; 23) including an integrated circuit having individual means integrally formed in a multi-layered structure, characterized by comprising: an EEPROM (15; 35), located on a topmost layer, for storing input information; a ROM (14; 34), located on a second layer, for storing secret data and a program necessary for a control operation; a special arithmetic operation circuit (12; 32) and a RAM (13; 33), both located on a third layer, for encrypting and decrypting an input signal; and a CPU (11; 31), located on a bottom layer, for performing general control of said portable medium (3; 23) and exchanging information with an external unit.
Claim 7
Dependent Claim
129 words
An information processing apparatus characterized by comprising: first means (49) for reading an encryption key from a portable medium (1; 20) having said encryption key stored in an unanalyzable manner; means (47) for supplying information; means (40) for encrypting said information supplied from said supplying means (47), using said encryption key read out by said first reading means (49); means (44) for storing said information encrypted by said encrypting means (40) on an information recording medium (43); second means (44) for reading information from said information recording medium (43); means (40) for decrypting said information read out by said second reading means (44), using said encryption key read out by said first reading means (49); and means (46, 48) for outputting said information decrypted by said decrypting means (40).
Claim 8
Dependent Claim
151 words
An information processing apparatus characterized by comprising: means (49) for receiving a portable medium (1; 20) provided with information encrypting means (11, 12; 31, 32) and information decrypting means (11, 12; 31, 32) in an unanalyzable manner; means (47) for supplying information; first processing means (3; 23) for encrypting said information supplied from said supplying means (47), using said information encrypting means (11, 12; 31, 32) of said received portable medium (1; 20); means (44) for storing said information encrypted by said first processing means (3; 23) on an information recording medium (43); means (44) for reading information from said information recording medium (43); second processing means (3; 23) for decrypting said information read out by said reading means (44), using said decrypting means (11, 12; 31, 32) of said received portable medium (1; 20); and means (46, 48) for outputting said information decrypted by said second processing means (3; 23).
References Cited (Backward Citations)
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