GB2308282B - Differential work factor cryptography method and system - Google Patents

Differential work factor cryptography method and system

Info

Publication number
GB2308282B
GB2308282B GB9625925A GB9625925A GB2308282B GB 2308282 B GB2308282 B GB 2308282B GB 9625925 A GB9625925 A GB 9625925A GB 9625925 A GB9625925 A GB 9625925A GB 2308282 B GB2308282 B GB 2308282B
Authority
GB
United Kingdom
Prior art keywords
system
work factor
cryptography method
differential work
differential
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
GB9625925A
Other versions
GB9625925D0 (en
GB2308282A (en
Inventor
Charles W Kaufman
Jr Stephen M Matyas
Raymond E Ozzie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lotus Development Corp
Original Assignee
Lotus Development Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US57322895A priority Critical
Priority to US08/573,110 priority patent/US5764772A/en
Application filed by Lotus Development Corp filed Critical Lotus Development Corp
Publication of GB9625925D0 publication Critical patent/GB9625925D0/en
Publication of GB2308282A publication Critical patent/GB2308282A/en
Application granted granted Critical
Publication of GB2308282B publication Critical patent/GB2308282B/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00Cryptographic mechanisms or cryptographic arrangements for secret or secure communication
    • H04L9/08Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0816Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0819Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
    • H04L9/0825Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s) using asymmetric-key encryption or public key infrastructure [PKI], e.g. key signature or public key certificates
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00Cryptographic mechanisms or cryptographic arrangements for secret or secure communication
    • H04L9/08Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/088Usage controlling of secret information, e.g. techniques for restricting cryptographic keys to pre-authorized uses, different access levels, validity of crypto-period, different key- or password length, or different strong and weak cryptographic algorithms
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/60Digital content management, e.g. content distribution
    • H04L2209/605Copy protection
GB9625925A 1995-12-15 1996-12-13 Differential work factor cryptography method and system Expired - Fee Related GB2308282B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US57322895A true 1995-12-15 1995-12-15
US08/573,110 US5764772A (en) 1995-12-15 1995-12-15 Differential work factor cryptography method and system

Publications (3)

Publication Number Publication Date
GB9625925D0 GB9625925D0 (en) 1997-01-29
GB2308282A GB2308282A (en) 1997-06-18
GB2308282B true GB2308282B (en) 2000-04-12

Family

ID=27076032

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9625925A Expired - Fee Related GB2308282B (en) 1995-12-15 1996-12-13 Differential work factor cryptography method and system

Country Status (5)

Country Link
JP (1) JPH1028114A (en)
KR (1) KR100445737B1 (en)
DE (1) DE19652295B4 (en)
FR (1) FR2742617B1 (en)
GB (1) GB2308282B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2329096A (en) * 1997-08-29 1999-03-10 Ncipher Limited Creating sub-keys from hashed cryptographic master key
US6578143B1 (en) * 1998-12-18 2003-06-10 Qualcomm Incorporated Method for negotiating weakened keys in encryption systems
US6636968B1 (en) 1999-03-25 2003-10-21 Koninklijke Philips Electronics N.V. Multi-node encryption and key delivery
AT335491T (en) 1999-05-10 2006-09-15 Toshio Doi Drug against glomerulosclerosis
GB2390270A (en) * 2002-06-27 2003-12-31 Ericsson Telefon Ab L M Escrowing with an authority only part of the information required to reconstruct a decryption key
DE102005013909A1 (en) * 2005-03-24 2006-09-28 Siemens Ag Device and method for key reduction
US7873166B2 (en) 2005-09-13 2011-01-18 Avaya Inc. Method for undetectably impeding key strength of encryption usage for products exported outside the U.S
US8345871B2 (en) * 2007-03-15 2013-01-01 Palo Alto Research Center Incorporated Fast authentication over slow channels
US8199917B2 (en) * 2008-10-29 2012-06-12 International Business Machines Corporation SID management for access to encrypted drives

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5315658A (en) * 1992-04-20 1994-05-24 Silvio Micali Fair cryptosystems and methods of use

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5323464A (en) * 1992-10-16 1994-06-21 International Business Machines Corporation Commercial data masking
US5557765A (en) * 1994-08-11 1996-09-17 Trusted Information Systems, Inc. System and method for data recovery

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5315658A (en) * 1992-04-20 1994-05-24 Silvio Micali Fair cryptosystems and methods of use
US5315658B1 (en) * 1992-04-20 1995-09-12 Silvio Micali Fair cryptosystems and methods of use

Also Published As

Publication number Publication date
FR2742617B1 (en) 2000-08-18
DE19652295B4 (en) 2009-05-14
GB2308282A (en) 1997-06-18
FR2742617A1 (en) 1997-06-20
KR970056124A (en) 1997-07-31
JPH1028114A (en) 1998-01-27
GB9625925D0 (en) 1997-01-29
DE19652295A1 (en) 1997-06-19
KR100445737B1 (en) 2004-11-03

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
746 Register noted 'licences of right' (sect. 46/1977)

Effective date: 20071127

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20111213