GB0019286D0 - A method and apparatus for encrypting and decrypting data - Google Patents

A method and apparatus for encrypting and decrypting data

Info

Publication number
GB0019286D0
GB0019286D0 GB0019286A GB0019286A GB0019286D0 GB 0019286 D0 GB0019286 D0 GB 0019286D0 GB 0019286 A GB0019286 A GB 0019286A GB 0019286 A GB0019286 A GB 0019286A GB 0019286 D0 GB0019286 D0 GB 0019286D0
Authority
GB
United Kingdom
Prior art keywords
encrypting
packet
key
decrypting
data
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.)
Granted
Application number
GB0019286A
Other versions
GB2365719B (en
GB2365719A (en
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.)
CCE Ltd
Original Assignee
CCE Ltd
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 CCE Ltd filed Critical CCE Ltd
Priority to GB0019286A priority Critical patent/GB2365719B/en
Publication of GB0019286D0 publication Critical patent/GB0019286D0/en
Priority to AU2001267748A priority patent/AU2001267748A1/en
Priority to PCT/GB2001/003017 priority patent/WO2002013454A1/en
Publication of GB2365719A publication Critical patent/GB2365719A/en
Application granted granted Critical
Publication of GB2365719B publication Critical patent/GB2365719B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0891—Revocation or update of secret information, e.g. encryption key update or rekeying
    • 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
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0838—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/34—Encoding or coding, e.g. Huffman coding or error correction

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

A method of encrypting data which comprises dividing the data into packets, encrypting the packet using a modified key which is a modification of the key used for encrypting the previous packet, and adding information on the modified key used for encrypting a packet to the encrypted packet in dependence upon the key used for encrypting a previous packet. When decrypting the encrypted data, the information on the modified key is extracted from the encrypted packet in dependence upon the key used for decrypting the previous packet and the extracted key is used for decrypting the encrypted data packets.
GB0019286A 2000-08-04 2000-08-04 A method and apparatus for encrypting and decrypting data Expired - Fee Related GB2365719B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB0019286A GB2365719B (en) 2000-08-04 2000-08-04 A method and apparatus for encrypting and decrypting data
AU2001267748A AU2001267748A1 (en) 2000-08-04 2001-07-06 A method and apparatus for encrypting and decrypting data
PCT/GB2001/003017 WO2002013454A1 (en) 2000-08-04 2001-07-06 A method and apparatus for encrypting and decrypting data

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0019286A GB2365719B (en) 2000-08-04 2000-08-04 A method and apparatus for encrypting and decrypting data

Publications (3)

Publication Number Publication Date
GB0019286D0 true GB0019286D0 (en) 2000-09-27
GB2365719A GB2365719A (en) 2002-02-20
GB2365719B GB2365719B (en) 2003-09-03

Family

ID=9897072

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0019286A Expired - Fee Related GB2365719B (en) 2000-08-04 2000-08-04 A method and apparatus for encrypting and decrypting data

Country Status (3)

Country Link
AU (1) AU2001267748A1 (en)
GB (1) GB2365719B (en)
WO (1) WO2002013454A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5319712A (en) * 1993-08-26 1994-06-07 Motorola, Inc. Method and apparatus for providing cryptographic protection of a data stream in a communication system
US5659615A (en) * 1994-11-14 1997-08-19 Hughes Electronics Secure satellite receive-only local area network with address filter
JP3760460B2 (en) * 1997-04-23 2006-03-29 ソニー株式会社 Data transmitting apparatus and method, data receiving apparatus and method, and data transmitting / receiving system and method

Also Published As

Publication number Publication date
WO2002013454A1 (en) 2002-02-14
GB2365719B (en) 2003-09-03
AU2001267748A1 (en) 2002-02-18
GB2365719A (en) 2002-02-20

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Legal Events

Date Code Title Description
COOA Change in applicant's name or ownership of the application
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20040804