GB0302651D0 - Encryption systems - Google Patents

Encryption systems

Info

Publication number
GB0302651D0
GB0302651D0 GB0302651A GB0302651A GB0302651D0 GB 0302651 D0 GB0302651 D0 GB 0302651D0 GB 0302651 A GB0302651 A GB 0302651A GB 0302651 A GB0302651 A GB 0302651A GB 0302651 D0 GB0302651 D0 GB 0302651D0
Authority
GB
United Kingdom
Prior art keywords
portions
level
data
encryption
codes
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Withdrawn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
GB0302651A
Other versions
GB2398210A (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.)
Sony Europe Ltd
Original Assignee
Sony United Kingdom 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 Sony United Kingdom Ltd filed Critical Sony United Kingdom Ltd
Priority to GB0302651A priority Critical patent/GB2398210A/en
Publication of GB0302651D0 publication Critical patent/GB0302651D0/en
Publication of GB2398210A publication Critical patent/GB2398210A/en
Withdrawn legal-status Critical Current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
    • H04L9/08—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
    • H04L9/0819—Key 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)
    • H04L9/083—Key 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) involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP]
    • H04L9/0833—Key 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) involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP] involving conference or group key
    • H04L9/0836—Key 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) involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP] involving conference or group key using tree structure or hierarchical structure
    • 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
    • H04L2209/56—Financial cryptography, e.g. electronic payment or e-cash
    • 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
    • H04L2209/60—Digital content management, e.g. content distribution
    • H04L2209/608—Watermarking

Abstract

A method of applying encryption to a set of ordinally numbered portions of data, comprises: producing an ordinally numbered set of encryption codes in accordance with a binary tree structure having L levels l where l is 0, 1, 2 ....L, each level having 2<l> nodes, each node in level l being linked to two nodes in the next higher level l + 1 and one node in the next lower level l - 1, the number of levels L being such that level L has a number 2<L> nodes not less than the number of said portions of data, each node of level l having associated therewith an encryption code generated from the encryption code associated with the node of level l-1 with which it is linked; and applying the respective encryption codes of level L to respective ones of the said portions of data. A method of decrypting a predetermined subset of portions of data encrypted by the encryption comprises specifying a sub-set of the ordinally numbered portions; generating decryption codes for decrypting the said subset of encrypted portions receiving the said decryption data; generating from the said decryption data the decryption codes of the said subset of portions of data; and decrypting the said portions of the said subset using the generated decryption codes.
GB0302651A 2003-02-05 2003-02-05 Encryption using a binary tree structure Withdrawn GB2398210A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0302651A GB2398210A (en) 2003-02-05 2003-02-05 Encryption using a binary tree structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0302651A GB2398210A (en) 2003-02-05 2003-02-05 Encryption using a binary tree structure

Publications (2)

Publication Number Publication Date
GB0302651D0 true GB0302651D0 (en) 2003-03-12
GB2398210A GB2398210A (en) 2004-08-11

Family

ID=9952492

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0302651A Withdrawn GB2398210A (en) 2003-02-05 2003-02-05 Encryption using a binary tree structure

Country Status (1)

Country Link
GB (1) GB2398210A (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7519274B2 (en) 2003-12-08 2009-04-14 Divx, Inc. File format for multiple track digital data
US8472792B2 (en) 2003-12-08 2013-06-25 Divx, Llc Multimedia distribution system
EP1999883A4 (en) 2006-03-14 2013-03-06 Divx Llc Federated digital rights management scheme including trusted systems
CN103561278B (en) 2007-01-05 2017-04-12 索尼克知识产权股份有限公司 Video distribution system including progressive playback
CN101861583B (en) 2007-11-16 2014-06-04 索尼克Ip股份有限公司 Hierarchical and reduced index structures for multimedia files
CA2782825C (en) 2009-12-04 2016-04-26 Divx, Llc Elementary bitstream cryptographic material transport systems and methods
US9247312B2 (en) 2011-01-05 2016-01-26 Sonic Ip, Inc. Systems and methods for encoding source media in matroska container files for adaptive bitrate streaming using hypertext transfer protocol
US9467708B2 (en) 2011-08-30 2016-10-11 Sonic Ip, Inc. Selection of resolutions for seamless resolution switching of multimedia content
US8787570B2 (en) 2011-08-31 2014-07-22 Sonic Ip, Inc. Systems and methods for automatically genenrating top level index files
US8909922B2 (en) 2011-09-01 2014-12-09 Sonic Ip, Inc. Systems and methods for playing back alternative streams of protected content protected using common cryptographic information
US9191457B2 (en) 2012-12-31 2015-11-17 Sonic Ip, Inc. Systems, methods, and media for controlling delivery of content
JP6944371B2 (en) 2015-01-06 2021-10-06 ディビックス， エルエルシー Systems and methods for encoding content and sharing content between devices

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1075108A1 (en) * 1999-07-23 2001-02-07 BRITISH TELECOMMUNICATIONS public limited company Cryptographic data distribution
US20020076204A1 (en) * 2000-12-18 2002-06-20 Toshihisa Nakano Key management device/method/program, recording medium, reproducing device/method, recording device, and computer-readable, second recording medium storing the key management program for copyright protection

Also Published As

Publication number Publication date
GB2398210A (en) 2004-08-11

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)