US Patent No: 7,260,727

Number of patents in Portfolio can not be more than 2000

Method for secure storage of sensitive data in a memory of an embedded microchip system, particularly a smart card, and embedded system implementing the method

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ALSO PUBLISHED AS: 20020108051
ATTORNEY / AGENT: (SPONSORED)
 

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Abstract

The invention concerns a method for secure storage of a piece of so-called sensitive data, for example an encryption key, in a memory (M) of an embedded microchip system, particularly a smart card (CP). The memory (M) comprises two physically distinct storage devices (1, 2), for example a permanent memory of the "ROM" type (1), and a second, re-programmable memory of the "EEPROM" type (2). The piece of sensitive data is divided into at least two parts (d, d'), in a given logical configuration, each of these parts being stored in one of the distinct storage devices (1, 2). An additional piece of verification data, a checksum or hash data, can also be stored in the first storage device (1), at the same time as the first sensitive data part (d).The invention also concerns an embedded microchip system, particularly a smart card (CP).

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First Claim

Related Publications

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CP8 TECHNOLOGIESPARIS86

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bole, Beno Versailles, FR 1 2
Fougeroux, Nicolas Le Chesnay, FR 8 30
Hameau, Patrice Boulogne Billancourt, FR 10 32

Cited Art

Patent Info (Count) # Cites Year
 
CERTCO, INC. (7)
5,799,086 Enhanced cryptographic system and method with key escrow feature 181 1997
5,850,451 Enhanced cryptographic system and method with key escrow feature 68 1997
5,857,022 Enhanced cryptographic system and method with key escrow feature 57 1997
5,872,849 Enhanced cryptographic system and method with key escrow feature 67 1997
6,009,177 Enhanced cryptographic system and method with key escrow feature 174 1997
5,841,865 Enhanced cryptographic system and method with key escrow feature 98 1997
6,411,716 Method of changing key fragments in a multi-step digital signature system 38 1998
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (7)
5,553,144 Method and system for selectively altering data processing system functional characteristics without mechanical manipulation 17 1995
5,912,453 Multiple application chip card with decoupled programs 77 1996
5,907,618 Method and apparatus for verifiably providing key recovery information in a cryptographic system 56 1997
6,175,924 Method and apparatus for protecting application data in secure storage areas 129 1997
6,058,188 Method and apparatus for interoperable validation of key recovery information in a cryptographic system 39 1997
6,335,972 Framework-based cryptographic key recovery system 31 1997
6,396,929 Apparatus, method, and computer program product for high-availability multi-agent cryptographic key recovery 9 1998
 
BELL ATLANTIC NETWORK SERVICES, INC. (4)
5,557,678 System and method for centralized session key distribution, privacy enhanced messaging and information distribution using a split private key public cryptosystem 128 1994
5,737,419 Computer system for securing communications using split private key asymmetric cryptography 82 1996
5,748,735 Securing E-mail communications and encrypted file storage using yaksha split private key asymmetric cryptography 82 1996
5,838,792 Computer system for centralized session key distribution, privacy enhanced messaging and information distribution using a split private key public cryptosystem 66 1996
 
MOTOROLA MOBILITY LLC (3)
5,623,546 Encryption method and system for portable data 92 1995
6,084,968 Security token and method for wireless applications 52 1997
6,295,606 Method and apparatus for preventing information leakage attacks on a microelectronic assembly 44 1999
 
EMC CORPORATION (2)
5,633,929 Cryptographic key escrow system having reduced vulnerability to harvesting attacks 106 1995
5,901,227 Method and apparatus for implementing partial and complete optional key escrow 74 1996
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (2)
5,675,649 Process for cryptographic key generation and safekeeping 57 1995
5,953,422 Secure two-piece user authentication in a computer network 79 1996
 
INFINEON TECHNOLOGIES AG (2)
6,182,217 Electronic data-processing device and system 18 1999
6,934,854 Circuit and method for protecting electronic devices 1 2002
 
INTEL CORPORATION (2)
5,828,753 Circuit and method for ensuring interconnect security within a multi-chip integrated circuit package 30 1996
6,209,098 Circuit and method for ensuring interconnect security with a multi-chip integrated circuit package 87 1998
 
TALLGRASS PRAIRIE MANAGEMENT (2)
5,436,972 Method for preventing inadvertent betrayal by a trustee of escrowed digital secrets 72 1993
6,216,229 Method for preventing inadvertent betrayal by a trustee of escrowed digital secrets 10 2000
 
TECSEC, INCORPORATED (2)
5,787,173 Cryptographic key management method and apparatus 65 1997
6,490,680 Access control and authorization system 149 1998
 
BULL CP8 (1)
6,253,163 Portable object reader terminal and process for self-diagnosis and supervision of same 9 1998
 
BULL S.A. (1)
6,483,920 Key recovery process used for strong encryption of messages 6 1997
 
CP8 TECHNOLOGIES (1)
5,533,126 Key protection device for smart cards 79 1994
 
CROWLEY, JOHN J. (1)
5,375,169 Cryptographic key management method and apparatus 104 1993
 
CRYPTOGRAPHY RESEARCH, INC. (1)
6,289,455 Method and apparatus for preventing piracy of digital content 209 1999
 
DETHLOFF, JUERGEN (1)
4,968,873 Smart card issuing and receiving apparatus 278 1989
 
Entrust Technologies Limited (1)
6,393,565 Data management system and method for a limited capacity cryptographic storage unit 27 1998
 
GEMALTO SA (1)
6,101,254 Security method for making secure an authentication method that uses a secret key algorithm 14 1997
 
GEMPLUS (1)
5,910,989 Method for the generation of electronic signatures, in particular for smart cards 73 1997
 
Gemplus Card International (1)
5,682,031 Smart card and smart card locking process therefor 9 1995
 
GENERAL DYNAMICS ADVANCED INFORMATION SYSTEMS, INC. (1)
2004/0054,914 Method and apparatus for in-line serial data encryption 9 2003
 
INTEGRATED TECHNOLOGOES OF AMERICA, INC. (1)
6,351,813 Access control/crypto system 178 1998
 
KABUSHIKI KAISHA TOSHIBA (1)
6,651,149 Data storage medium with certification data 42 1999
 
LG ELECTRONICS INC. (1)
5,757,909 Illegal view and copy protection method in digital video system and controlling method thereof 100 1995
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1)
5,199,070 Method for generating a public key 45 1991
 
MCAFEE, INC. (1)
5,557,346 System and method for key escrow encryption 132 1994
 
MITSUBISHI DENKI KABUSHIKI KAISHA (1)
5,159,183 IC card 8 1989
 
NATIONAL SECURITY AGENCY, U.S. GOVERNMENT (1)
5,920,630 Method of public key cryptography that includes key escrow 62 1997
 
OKAMOTO, EIJI (1)
6,118,874 Encrypted data recovery method using split storage key and system thereof 33 1998
 
SECURITY FIRST CORP. (1)
6,853,988 Cryptographic server with provisions for interoperability between cryptographic systems 91 2000
 
SEIKO EPSON CORPORATION (1)
6,532,078 Split image-forming method and device and split image-printing method and device for tape printing apparatus 4 1998
 
STORAGETEK (1)
6,831,982 Encryption key management system using multiple smart cards 6 1999
 
SYMANTEC CORPORATION (1)
6,662,299 Method and apparatus for reconstituting an encryption key based on multiple user responses 22 1999
 
U.S. Philips Corporation (1)
5,467,081 Datacarriers with separate storage of read and write-inhibited memory locations 36 1993
 
WELLS FARGO BANK, NATIONAL ASSOCIATION (1)
2005/0138,374 Cryptographic key backup and escrow system 12 2004
 
Other [Check patent profile for assignment information] (5)
5,150,407 Secured data storage devices 97 1991
5,666,414 Guaranteed partial key-escrow 60 1996
5,647,000 Failsafe key escrow system 29 1996
6,202,150 Auto-escrowable and auto-certifiable cryptosystems 16 1997
2002/0013,898 Method and apparatus for roaming use of cryptographic values 36 2001

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
GENERAL DYNAMICS ADVANCED INFORMATION SYSTEMS, INC. (1)
7,650,510 Method and apparatus for in-line serial data encryption 1 2003
 
MASTERCARD INTERNATIONAL INCORPORATED (1)
8,117,449 Method to detect man-in-the-middle (MITM) or relay attacks 0 2007

Maintenance Fees

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7.5 Year Payment $3600.00 $1800.00 $900.00 Feb 21, 2015
11.5 Year Payment $7400.00 $3700.00 $1850.00 Feb 21, 2019
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Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge after expiration - Late payment is unavoidable $700.00 $350.00 $175.00
Surcharge after expiration - Late payment is unintentional $1,640.00 $820.00 $410.00