EP0277186A1 - Chiffrement de donnees - Google Patents

Chiffrement de donnees

Info

Publication number
EP0277186A1
EP0277186A1 EP19870905233 EP87905233A EP0277186A1 EP 0277186 A1 EP0277186 A1 EP 0277186A1 EP 19870905233 EP19870905233 EP 19870905233 EP 87905233 A EP87905233 A EP 87905233A EP 0277186 A1 EP0277186 A1 EP 0277186A1
Authority
EP
European Patent Office
Prior art keywords
algorithm
bits
bit
data
blocks
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.)
Withdrawn
Application number
EP19870905233
Other languages
German (de)
English (en)
Inventor
John Philip Chambers
Derek Thomas Wright
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.)
British Broadcasting Corp
Original Assignee
British Broadcasting 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
Application filed by British Broadcasting Corp filed Critical British Broadcasting Corp
Publication of EP0277186A1 publication Critical patent/EP0277186A1/fr
Withdrawn legal-status Critical Current

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
    • H04L9/06—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Storage Device Security (AREA)

Abstract

Le chiffrement et le déchiffrement de données est réalisé par la conversion de blocs de bits d'entrée en blocs de bits de sortie. Les bits d'entrée sont transformés à l'aide d'un algorythme du type conforme à la norme DES de chiffrement de données, définissant une pluralité d'opérations de permutation et/ou de substitution de bit sélectionnées sous la commande d'un code de longueur substantielle. Dans la présente invention, les opérations permettant la sélection par le code sont modifiées en réponse aux données de commande d'opérations reçues en provenance d'une source externe faisant appel par exemple à l'emploi d'un télétexte ou d'un vidéotexte, ou bien mettant en oeuvre des lecteurs de cartes ou de codes à barres ou encore une saisie directe sur clavier.
EP19870905233 1986-08-08 1987-08-06 Chiffrement de donnees Withdrawn EP0277186A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8619453 1986-08-08
GB8619453A GB8619453D0 (en) 1986-08-08 1986-08-08 Data encipherment

Publications (1)

Publication Number Publication Date
EP0277186A1 true EP0277186A1 (fr) 1988-08-10

Family

ID=10602487

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870905233 Withdrawn EP0277186A1 (fr) 1986-08-08 1987-08-06 Chiffrement de donnees

Country Status (4)

Country Link
EP (1) EP0277186A1 (fr)
JP (1) JPH01500794A (fr)
GB (2) GB8619453D0 (fr)
WO (1) WO1988001119A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2228650A (en) * 1989-01-24 1990-08-29 P C Hire Ltd A data encryption device
BE1003932A6 (fr) * 1989-04-28 1992-07-22 Musyck Emile Systeme cryptographique par bloc de donnees binaires.
US5003597A (en) * 1989-12-21 1991-03-26 Xerox Corporation Method and apparatus for data encryption
RU2141729C1 (ru) * 1998-01-19 1999-11-20 Государственное унитарное предприятие Специализированный центр программных систем "Спектр" Способ криптографического преобразования блоков двоичных данных
GB2415798A (en) * 2004-06-29 2006-01-04 Farhad Dalvi A non-deterministic secret key cipher using bit permutations

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4275265A (en) * 1978-10-02 1981-06-23 Wisconsin Alumni Research Foundation Complete substitution permutation enciphering and deciphering circuit
FR2486680B1 (fr) * 1980-07-11 1986-07-25 Trt Telecom Radio Electr Procede et dispositif de permutation des elements d'un ensemble
SE426128B (sv) * 1981-04-08 1982-12-06 Philips Svenska Ab Metod vid overforing av datameddelanden mellan tva stationer, samt overforingsanleggning for utforande av metoden
US4531020A (en) * 1982-07-23 1985-07-23 Oak Industries Inc. Multi-layer encryption system for the broadcast of encrypted information
GB2131586B (en) * 1982-12-03 1985-11-20 Burroughs Corp Autoteller systems
GB2149944A (en) * 1983-11-14 1985-06-19 Softnet Inc Software distribution
GB2154108B (en) * 1984-02-07 1987-06-03 Communications Patents Ltd Broadcasting system
JPS6120442A (ja) * 1984-07-09 1986-01-29 Toshiba Corp 有料放送方式
DE3565918D1 (en) * 1984-08-10 1988-12-01 Gretag Ag Enciphering/deciphering method
US4649233A (en) * 1985-04-11 1987-03-10 International Business Machines Corporation Method for establishing user authenication with composite session keys among cryptographically communicating nodes
FR2582174B1 (fr) * 1985-05-15 1990-03-09 Thomson Csf Dispositif de chiffrement par substitutions-permutations

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8801119A1 *

Also Published As

Publication number Publication date
GB8718674D0 (en) 1987-09-09
GB8619453D0 (en) 1986-09-17
JPH01500794A (ja) 1989-03-16
GB2194419A (en) 1988-03-02
WO1988001119A1 (fr) 1988-02-11

Similar Documents

Publication Publication Date Title
US5008935A (en) Efficient method for encrypting superblocks of data
US4751733A (en) Substitution permutation enciphering device
US5548648A (en) Encryption method and system
US5261003A (en) Data communication system and method with data scrambling
US5479512A (en) Method and apparatus for performing concryption
US5425103A (en) Variable-key cryptography system
US7760870B2 (en) Block cipher apparatus using auxiliary transformation
US4668103A (en) Polygraphic encryption-decryption communications system
EP0342832B1 (fr) Dispositif de réaction dynamique pour générateur de séquence de clé d'un brouilleur
US6125182A (en) Cryptographic engine using logic and base conversions
KR20020006475A (ko) 암호화장치, 복호장치 및 확대키 생성장치, 확대키생성방법 및 기록매체
JP2002532766A (ja) 並列接続された暗号化ブロックを備える暗号装置
EP0277186A1 (fr) Chiffrement de donnees
US6301361B1 (en) Encoding and decoding information using randomization with an alphabet of high dimensionality
US5614900A (en) Variable word length code decoding apparatus having plural decoding tables for decoding long words
CN113095042B (zh) 一种字符串加密方法、系统、装置及存储介质
US4177355A (en) Array device for data scrambling
KR970005596B1 (ko) 디지틀 정보의 암호화 및 복호화 방법
JP2551068B2 (ja) 暗号化装置
EP1179243A1 (fr) Moteur cryptographique utilisant la conversion de base de numeration, des operations logiques et un generateur de nombres pseudo-aleatoires pour des matrices de donnees de fa on a augmenter la dispersion dans le texte chiffre
RU2130641C1 (ru) Способ и устройство защиты информации от несанкционированного доступа
Nath et al. Modern Encryption Algorithm Version-1 (MEA-1)
KR20000066704A (ko) 디지털 데이터의 카오스 암호화 및 복원시스템
JPH08307393A (ja) 情報通信方法および装置
JPH11272168A (ja) 暗号鍵の発行方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR NL

17P Request for examination filed

Effective date: 19880729

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19920303