NO980325L - Fremgangsmåte og anordning for å generere kryptografinökler - Google Patents

Fremgangsmåte og anordning for å generere kryptografinökler

Info

Publication number
NO980325L
NO980325L NO980325A NO980325A NO980325L NO 980325 L NO980325 L NO 980325L NO 980325 A NO980325 A NO 980325A NO 980325 A NO980325 A NO 980325A NO 980325 L NO980325 L NO 980325L
Authority
NO
Norway
Prior art keywords
key
work factor
keys
level
secret
Prior art date
Application number
NO980325A
Other languages
English (en)
Other versions
NO980325D0 (no
Inventor
Eric Sprunk
Original Assignee
Nextlevel Systems Inc
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
Application filed by Nextlevel Systems Inc filed Critical Nextlevel Systems Inc
Publication of NO980325D0 publication Critical patent/NO980325D0/no
Publication of NO980325L publication Critical patent/NO980325L/no

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
    • H04L9/0618—Block ciphers, i.e. encrypting groups of characters of a plain text message using fixed encryption transformation
    • H04L9/0625—Block ciphers, i.e. encrypting groups of characters of a plain text message using fixed encryption transformation with splitting of the data block into left and right halves, e.g. Feistel based algorithms, DES, FEAL, IDEA or KASUMI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
    • H04L9/065—Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems, RC4, SEAL or A5/3
    • H04L9/0656—Pseudorandom key sequence combined element-for-element with data sequence, e.g. one-time-pad [OTP] or Vernam's cipher
    • H04L9/0662—Pseudorandom key sequence combined element-for-element with data sequence, e.g. one-time-pad [OTP] or Vernam's cipher with particular pseudorandom sequence generator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/088—Usage 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0894—Escrow, recovery or storing of secret information, e.g. secret key escrow or cryptographic key storage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence

Abstract

Fremgangsmåte og anordning for generering av kryptografinøkler for bruk ved et kryp- tografisystem innbefattende en nøkkelgenerator for å generere et delsett av reduserte nøkkelromnøkler for en større B-bitkryptografinøkkel. Delsettet med nøkler fordeles tilfeldig over en B-bitnøkkelrom i samsvar med en hemmelig spredning eller forde- lingsnøkkel for å tilveiebringe kryptografinøkler med større tilsynelatende arbeidsfaktor. Arbeidsfaktoren avhenger av antall mulige forskjellige nøkler for en gitt nøkkelbitleng- de og tilveiebringe korresponderende nivå av degraderingsvanskeligheter for en fiendt- lig stilt angriper. Uten kunnskap om den hemmelige spredenøkkelen er arbeidsfaktoren til kryptografmøkkelen opp til S=2B og en angriper må utføre 2B gjetninger for å be- stemme en bestemt nøkkel med visshet. Vanskelighetsnivået vil typisk bli beregnings- messig intens for å angriperen for å bryte systemet. Kunnskapen om den hemmelige spredenøkkelen vil imidlertid gjøre arbeidsfaktoren betydelig lavere. Arbeidsfaktoren til nøkkelen kan således bli redusert til et nivå som er lite nok til å tilfredsstille myndighe- tens eksport- eller importkrav uten å redusere beskyttelsesnivået eller systemets styrke. En enkel kryptografmøkkelgenerator (motor) kan lett bli tilpasset for bruk i forskjellige land hvor forskjellige arbeidsfaktorer kreves.
NO980325A 1995-07-27 1998-01-26 Fremgangsmåte og anordning for å generere kryptografinökler NO980325L (no)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US158795P 1995-07-27 1995-07-27
US65057996A 1996-05-31 1996-05-31
PCT/US1996/012296 WO1997005720A2 (en) 1995-07-27 1996-07-26 Cryptographic system with concealed work factor

Publications (2)

Publication Number Publication Date
NO980325D0 NO980325D0 (no) 1998-01-26
NO980325L true NO980325L (no) 1998-03-05

Family

ID=26669231

Family Applications (1)

Application Number Title Priority Date Filing Date
NO980325A NO980325L (no) 1995-07-27 1998-01-26 Fremgangsmåte og anordning for å generere kryptografinökler

Country Status (10)

Country Link
US (2) US6424713B1 (no)
EP (1) EP1048140A4 (no)
JP (1) JPH11511305A (no)
KR (1) KR19990035965A (no)
CN (1) CN1155192C (no)
AU (1) AU706247B2 (no)
BR (1) BR9610609A (no)
MX (1) MX9800726A (no)
NO (1) NO980325L (no)
WO (1) WO1997005720A2 (no)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997005720A2 (en) * 1995-07-27 1997-02-13 Nextlevel Systems, Inc. Cryptographic system with concealed work factor
JP2001525624A (ja) * 1997-12-01 2001-12-11 シーメンス アクチエンゲゼルシヤフト 第１の電子鍵用の所要メモリロケーションを低減する方法及び暗号化及び暗号解読用の装置
US6578143B1 (en) * 1998-12-18 2003-06-10 Qualcomm Incorporated Method for negotiating weakened keys in encryption systems
US6947560B1 (en) * 1999-04-26 2005-09-20 Telefonaktiebolaget L M Ericsson (Publ) Method and device for effective key length control
US6253223B1 (en) 1999-06-08 2001-06-26 General Instrument Corporation Robust random number generator
US6891951B2 (en) * 2000-01-21 2005-05-10 Victor Company Of Japan, Ltd. Cryptosystem-related method and apparatus
US7539313B1 (en) * 2000-09-13 2009-05-26 Nortel Networks Limited System and method for key management across geographic domains
US7502463B2 (en) * 2000-12-13 2009-03-10 Broadcom Corporation Methods and apparatus for implementing a cryptography engine
US7142671B2 (en) * 2000-12-13 2006-11-28 Broadcom Corporation Methods and apparatus for implementing a cryptography engine
US7366300B2 (en) * 2000-12-13 2008-04-29 Broadcom Corporation Methods and apparatus for implementing a cryptography engine
US7251326B2 (en) 2001-06-29 2007-07-31 Harris Corporation Method and apparatus for data encryption
AU2002351507B2 (en) * 2001-10-18 2005-11-17 Rovi Solutions Corporation Apparatus and method for accessing material using an entity locked secure registry
US7366302B2 (en) * 2003-08-25 2008-04-29 Sony Corporation Apparatus and method for an iterative cryptographic block
CN1713567B (zh) * 2004-09-24 2010-04-28 广州同应信息科技有限公司 一种映射密码的设置和使用方法
US7502475B2 (en) * 2003-11-14 2009-03-10 Broadcom Corporation Method and system for secure key generation
EP1659728A1 (en) 2004-11-17 2006-05-24 Broadcom Corporation Method and system for secure key generation
DE102005013909A1 (de) * 2005-03-24 2006-09-28 Siemens Ag Vorrichtung und Verfahren zur Schlüsselreduktion
FR2888433A1 (fr) * 2005-07-05 2007-01-12 St Microelectronics Sa Protection d'une quantite numerique contenue dans un circuit integre comportant une interface jtag
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
US20080037775A1 (en) * 2006-03-31 2008-02-14 Avaya Technology Llc Verifiable generation of weak symmetric keys for strong algorithms
US8341727B2 (en) * 2007-03-09 2012-12-25 Se Cure 64 Software Corporation Method and system for protecting a computer system from denial-of-service attacks and other deleterious resource-draining phenomena related to communications
WO2010056756A2 (en) * 2008-11-11 2010-05-20 Aeronix, Inc. Method and apparatus for improved secure transmission between wireless communication components
US20120185699A1 (en) * 2011-01-14 2012-07-19 International Business Machines Corporation Space-efficient encryption with multi-block binding
CN110602570B (zh) * 2019-11-12 2020-02-21 成都索贝数码科技股份有限公司 一种基于非对称加密的视音频可信播放方法

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4304961A (en) * 1980-03-03 1981-12-08 Burroughs Corporation Authenticator code generator
US4661658A (en) * 1985-02-12 1987-04-28 International Business Machines Corporation Offline PIN validation with DES
US4908861A (en) * 1987-08-28 1990-03-13 International Business Machines Corporation Data authentication using modification detection codes based on a public one way encryption function
US5073935A (en) * 1990-12-17 1991-12-17 Jose Pastor Method for secure communication
US5323464A (en) * 1992-10-16 1994-06-21 International Business Machines Corporation Commercial data masking
GB2274229A (en) * 1992-12-19 1994-07-13 Ibm Cryptography system.
JPH0812537B2 (ja) * 1993-03-11 1996-02-07 日本電気株式会社 暗号化装置
US5483598A (en) * 1993-07-01 1996-01-09 Digital Equipment Corp., Patent Law Group Message encryption using a hash function
US5604806A (en) * 1995-01-20 1997-02-18 Ericsson Inc. Apparatus and method for secure radio communication
KR0144788B1 (ko) * 1995-07-04 1998-08-01 양승택 대표성을 이용한 차세대 개인통신 암호화 시스템
WO1997005720A2 (en) * 1995-07-27 1997-02-13 Nextlevel Systems, Inc. Cryptographic system with concealed work factor
CA2164768C (en) * 1995-12-08 2001-01-23 Carlisle Michael Adams Constructing symmetric ciphers using the cast design procedure
US5764772A (en) * 1995-12-15 1998-06-09 Lotus Development Coporation Differential work factor cryptography method and system
US5815573A (en) * 1996-04-10 1998-09-29 International Business Machines Corporation Cryptographic key recovery system
US5796830A (en) * 1996-07-29 1998-08-18 International Business Machines Corporation Interoperable cryptographic key recovery system

Also Published As

Publication number Publication date
AU706247B2 (en) 1999-06-10
WO1997005720A3 (en) 2000-08-03
JPH11511305A (ja) 1999-09-28
MX9800726A (es) 1998-04-30
KR19990035965A (ko) 1999-05-25
AU6681096A (en) 1997-02-26
WO1997005720A2 (en) 1997-02-13
EP1048140A4 (en) 2001-01-24
NO980325D0 (no) 1998-01-26
CN1195439A (zh) 1998-10-07
US6424713B1 (en) 2002-07-23
EP1048140A2 (en) 2000-11-02
CN1155192C (zh) 2004-06-23
US20030007644A1 (en) 2003-01-09
BR9610609A (pt) 1999-06-29

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