MX9800726A - Sistema criptografico con coeficiente de trabajo oculto. - Google Patents

Sistema criptografico con coeficiente de trabajo oculto.

Info

Publication number
MX9800726A
MX9800726A MX9800726A MX9800726A MX9800726A MX 9800726 A MX9800726 A MX 9800726A MX 9800726 A MX9800726 A MX 9800726A MX 9800726 A MX9800726 A MX 9800726A MX 9800726 A MX9800726 A MX 9800726A
Authority
MX
Mexico
Prior art keywords
key
cryptographic
keys
work factor
level
Prior art date
Application number
MX9800726A
Other languages
English (en)
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 MX9800726A publication Critical patent/MX9800726A/es

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

Un método y aparato para generar claves criptográficas para su uso en un sistema criptográfico, incluye un generador de claves para generar un subconjunto de claves de un numero de combinaciones reducido a partir de una clave criptográfica de bit B más amplia. El subconjunto de claves se distribuye aleatoriamente a través de un numero de combinaciones de bit B de acuerdo a una clave de distribucion o de informacion inservible secreta para proporcionar claves criptográficas con un coeficiente de trabajo aparente más amplio. El coeficiente de trabajo depende del numero de posibles claves diferentes para una longitud de bit de clave dada, y proporcionar un nivel correspondiente de dificultad de decodificacion a un atacante hostil. Sin el conocimiento de la clave de informacion inservible secreta, el coeficiente de trabajo de la clave criptográfica parece estar hasta S=2B, y se supone que un atacante debe recuperar hasta 2B, para determinar una clave específica con certeza. Este nivel de dificultad será típicamente demasiado intenso computacionalmente para que el atacante rompa el sistema. Sin embargo, con el conocimiento de la clave de la informacion inservible secreta, el coeficiente de trabajo es significativamente inferior. Así, el coeficiente de trabajo de la clave puede reducirse hasta un nivel en el cual es lo suficientemente pequeño para satisfacer los requerimientos de importacion y exportacion gubernamental sin reducir el nivel de proteccion o fuerza del sistema. Un solo generador de clave pictográfica (motor) puede adaptarse fácilmente para su uso en diferentes países, en donde se requieren coeficientes de trabajo diferentes.
MX9800726A 1995-07-27 1996-07-26 Sistema criptografico con coeficiente de trabajo oculto. MX9800726A (es)

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 (1)

Publication Number Publication Date
MX9800726A true MX9800726A (es) 1998-04-30

Family

ID=26669231

Family Applications (1)

Application Number Title Priority Date Filing Date
MX9800726A MX9800726A (es) 1995-07-27 1996-07-26 Sistema criptografico con coeficiente de trabajo oculto.

Country Status (10)

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

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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

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WO1997005720A2 (en) * 1995-07-27 1997-02-13 Nextlevel Systems, Inc. Cryptographic system with concealed work factor
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Also Published As

Publication number Publication date
AU706247B2 (en) 1999-06-10
WO1997005720A3 (en) 2000-08-03
JPH11511305A (ja) 1999-09-28
NO980325L (no) 1998-03-05
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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