CN1220384C - 压缩视频流的加密 - Google Patents

压缩视频流的加密 Download PDF

Info

Publication number
CN1220384C
CN1220384C CNB02805556XA CN02805556A CN1220384C CN 1220384 C CN1220384 C CN 1220384C CN B02805556X A CNB02805556X A CN B02805556XA CN 02805556 A CN02805556 A CN 02805556A CN 1220384 C CN1220384 C CN 1220384C
Authority
CN
China
Prior art keywords
encryption
data piece
frame
compressed video
algorithm
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.)
Expired - Fee Related
Application number
CNB02805556XA
Other languages
English (en)
Other versions
CN1494803A (zh
Inventor
埃里克·乔伯特
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.)
Nagravision SARL
Original Assignee
Nagravision SA
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 Nagravision SA filed Critical Nagravision SA
Publication of CN1494803A publication Critical patent/CN1494803A/zh
Application granted granted Critical
Publication of CN1220384C publication Critical patent/CN1220384C/zh
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4408—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream encryption, e.g. re-encrypting a decrypted video stream for redistribution in a home network
    • 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 or manipulating encoded video stream scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
    • H04N21/23476—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption by partially encrypting, e.g. encrypting the ending portion of a movie
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

本发明的目的在于使译码能力较弱的终端能够通过使用强力算法来接收压缩数据流。本发明利用了一个用于加密包括独立数据块和差异数据块的压缩视频流的方法，该方法在于根据不同的加密级别来加密独立数据块和差异数据块。

Description

压缩视频流的加密
技术领域
本发明涉及一个方法，该方法用于加密一个压缩视频流，特别在解密过程中，在提高安全级别的同时并不会损失资源。
背景技术
视频压缩算法是基于这样的事实，即：通常一幅图像和接下来的一幅之间差异较小、以及表现这些差异所需要的信息量比起表现整幅图像所需要的信息量大为减少。观察发现，从一幅图像到另一幅图像，大量的信息并没有改变、甚至在一个稍稍不同的区域被重新发现。
这个原理被应用于MPEG-2、MPEG-3或者Quick Time类型的格式中。
根据这些算法，第一幅图像——称作参照图——被完整传输，继而一个对后面图像的分析被实施以便确定并传输其间的差异。根据MPEG标准，我们区分完整传输的帧(I帧)、MV(运动向量)类型的差异数据以及DFD(运动向量模型和真实图像间的差异)类型的差异数据。
根据已知的解决方案，这些数据随后根据一个和想要的安全级别相适应的算法被加密。
为了在传输和处理过程中保持兼容性，每一组都被单独加密，就是说，各帧的属性仍然可见，只有内容被加密。
随着存储装置的发展，把加密数据——比如说一部电影——传送到用户单元是很普通的事情。
一旦文件被存储于用户单元，第三方尽可以花所需的时间来试着解密这些数据。
为了避免这个风险，第一步在于提高文件的安全级别，就是说，使用带有长密码的强力算法。
尽管这一方法在安全级别上是令人满意的，但是它也表现出需要在解密单元上投入重要资源的不便。
多种观看装置的发展方向是通过具有低编码能力的单元使用数据。这举例来说就是带有显示屏的新的移动电话的例子。对此类单元，实时使用复杂算法而不降低该单元的表现是不可能的。
因此，使用被强力算法加密的数据块不适合被用于所有类型的用户单元。
发明内容
因而本应用的目的是使得解码能力较弱的终端能够使用强力的算法。
这个目的是通过一个压缩视频流的加密方法来实现的，该压缩视频流包括独立数据块和差异数据块，所述方法根据不同的加密级别来加密独立数据块和差异数据块。
对独立数据块，我们理解为能够不参照前面的信息而从中获得解压信号的信息。举例来说可以是完整的帧(I帧)。
对差异数据块，我们理解为能够通过应用其中的差异信息修正前面的信号来获得解压信号的信息。
实际上，这个解决方案能够把最高的安全保护集中到对图像解压必不可少的信息上。根据这个方法，第一个算法被应用于压缩视频信号的完整帧(I帧)，第二个算法被应用于运动向量类型或者DFD类型的差异信息。
这一区别也可以通过根据数据类型使用不同长度的密码来实现。这样，完整帧将会被用一个2048二进制位的密码来加密，而差异信息则会被用一个128二进制位的密码来加密。
根据本发明的一个实施方式，差异信息不被加密。
应该注意的是，基于差异原理工作的其他的信息源也可以使用这一方法。这例来说就是根据MP3格式压缩音乐的例子。
附图说明
本发明将会在下面非限制性的附图的帮助下更好的被理解，其中：
图1描述了加密操作前的压缩流，
图2代表了加密形式的压缩流，
图3代表了传输中的压缩流。
具体实施方式
在图1中，压缩流用一系列的完整帧(I)和差异信息(P/B)来代表。根据这个例子，第一个完整帧I1后面跟着用来重建从完整帧I1到完整帧I2之间的连续帧的帧P/B1-2。
同样地，完整帧I2后面跟着用来到达完整帧I3的连续差异帧P/B2-3。
然后，这个数据流根据如图2中所描述的帧的类型被选择性的加密。在这个图中，我们用长度为2048二进制位的第一密码k1来加密完整帧I1、I2和I3。第二密码k2——比如说长128二进制位——被用来加密差异帧P/B1-2和P/B2-3。
这里给出的密码k1和k2的长度是作为说明示例，它可以是其它任何长度。
根据本发明，加密质量的差异可以在密码级别或者在所使用的算法级别上来实现。这样举例来说，根据k1的加密代表了一个IDEA(International Data Encryption Algorithm，国际数据加密算法)类算法，根据k2的加密代表了一个DES(Data EncryptionStandard，数据加密标准)类算法。
在这个数据流的传输过程中，完整帧如图3所描述被首先传送。
这一特性让接收单元立刻开始对需要较长处理时间的帧进行解密。一旦这些帧被解密，由于为差异帧所选择的算法类型可以快速执行，对差异帧的处理可以实时完成。
根据本发明的一个实施方式，对完整帧的加密级别根据其是第一帧——比如说帧I1——或是后面的帧(I2及I3)而不同。实际上，为从解密解压缩的信号获益，我们必须立刻处理第一帧，然后是差异帧。这就是为什么一个帧序列的第一帧使用一个比后面的完整帧更快的解密算法。
这一算法可以和用于差异帧的算法一样，也可以是另一个算法。

Claims (4)

1.一个加密压缩视频流的方法，所述压缩视频流包括独立数据块和差异数据块，其特征在于所述方法根据第一加密级别来加密独立数据块和根据第二加密级别来加密差异数据块，其中每一个数据块被独立地处理。
2.一个根据权利要求1加密压缩视频流的方法，其特征在于独立数据块用一个高级别算法加密，而差异数据块用一个快速解密算法加密。
3.一个根据权利要求1的加密压缩视频流的方法，其特征在于独立数据块用一个或几个长密码加密，而差异数据块用一个或几个短密码加密。
4.一个根据权利要求1至3中之一的加密压缩视频流的方法，其特征在于，在压缩信号的传输过程中，独立数据块被组成序列，这个方法在于加密所述序列第一数据块的加密级别不同于序列中的后续数据块的加密级别。
CNB02805556XA 2001-02-26 2002-02-25 压缩视频流的加密 Expired - Fee Related CN1220384C (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3442001 2001-02-26
CH20010344/2001 2001-02-26

Publications (2)

Publication Number Publication Date
CN1494803A CN1494803A (zh) 2004-05-05
CN1220384C true CN1220384C (zh) 2005-09-21

Family

ID=4506834

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB02805556XA Expired - Fee Related CN1220384C (zh) 2001-02-26 2002-02-25 压缩视频流的加密

Country Status (10)

Country Link
US (1) US7212636B2 (zh)
EP (1) EP1374588B1 (zh)
KR (1) KR100850825B1 (zh)
CN (1) CN1220384C (zh)
AT (1) ATE303699T1 (zh)
BR (1) BRPI0207581B1 (zh)
CA (1) CA2438599C (zh)
DE (1) DE60205879T2 (zh)
ES (1) ES2248516T3 (zh)
WO (1) WO2002069638A1 (zh)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7224310B2 (en) 2002-11-20 2007-05-29 Nagravision S.A. Method and device for the recognition of the origin of encrypted data broadcasting
EP1576819A1 (en) * 2002-12-16 2005-09-21 Koninklijke Philips Electronics N.V. Method and apparatus to encrypt video data streams
FR2849307B1 (fr) * 2002-12-24 2006-10-27 Viaccess Sa Procede et systeme de securisation de donnees embrouillees
US20040193871A1 (en) * 2003-03-28 2004-09-30 Broadcom Corporation System and method for transmitting data using selective partial encryption
CN100505866C (zh) * 2004-10-28 2009-06-24 武汉大学 一种视频信息的加解密方法
US20060269055A1 (en) * 2005-05-26 2006-11-30 International Business Machines Corporation Method and apparatus for improving performance and security of DES-CBC encryption algorithm
CN1758587B (zh) * 2005-09-06 2011-10-26 宏碁股份有限公司 资料处理方法
KR20090002939A (ko) * 2007-07-05 2009-01-09 삼성전자주식회사 디지털 방송 서비스에 있어서 비디오 데이터 송수신 장치및 방법
CN101286837B (zh) * 2008-05-13 2012-08-29 江苏大学 一种面向存储区域网的消息加密装置和方法
ES2556271T3 (es) 2008-08-22 2016-01-14 Qualcomm Incorporated Procedimiento y aparato para transmitir y recibir datos protegidos y datos no protegidos
US8472625B2 (en) * 2009-09-16 2013-06-25 Broadcom Corporation Method and system for protecting 3D video content
US9008308B2 (en) * 2012-02-08 2015-04-14 Vixs Systems, Inc Container agnostic decryption device and methods for use therewith
US8744078B2 (en) * 2012-06-05 2014-06-03 Secure Channels Sa System and method for securing multiple data segments having different lengths using pattern keys having multiple different strengths
ES2908859T3 (es) 2014-08-07 2022-05-04 Divx Llc Sistemas y métodos para proteger flujos de bits elementales que incorporan mosaicos codificados independientemente
CN104734723A (zh) * 2015-03-10 2015-06-24 中国人民解放军信息工程大学 一种基于压缩和加扰的数据变换方法
CN106209896B (zh) * 2016-07-29 2020-02-18 网宿科技股份有限公司 基于音视频格式的流媒体加密方法和模块
CN111757062A (zh) * 2020-06-29 2020-10-09 郑州信大捷安信息技术股份有限公司 一种视频流的高效安全传输方法和系统

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0856356A (ja) * 1994-08-10 1996-02-27 Fujitsu Ltd 符号化装置および復号化装置
US5623549A (en) * 1995-01-30 1997-04-22 Ritter; Terry F. Cipher mechanisms with fencing and balanced block mixing
US5805700A (en) * 1996-10-15 1998-09-08 Intel Corporation Policy based selective encryption of compressed video data
US5949884A (en) * 1996-11-07 1999-09-07 Entrust Technologies, Ltd. Design principles of the shade cipher
KR100389902B1 (ko) * 1997-06-23 2003-09-22 삼성전자주식회사 차분해독법과선형해독법에대하여안전성을보장하는고속블럭암호화방법
US6185679B1 (en) * 1998-02-23 2001-02-06 International Business Machines Corporation Method and apparatus for a symmetric block cipher using multiple stages with type-1 and type-3 feistel networks
ES2270494T3 (es) 1998-09-01 2007-04-01 Irdeto Access B.V. Sistema de comunicacion de datos.
US6490353B1 (en) * 1998-11-23 2002-12-03 Tan Daniel Tiong Hok Data encrypting and decrypting apparatus and method
US6950517B2 (en) * 2002-07-24 2005-09-27 Qualcomm, Inc. Efficient encryption and authentication for data processing systems
US7415109B2 (en) * 2002-08-23 2008-08-19 Qualcomm Incorporated Partial encryption and full authentication of message blocks

Also Published As

Publication number Publication date
DE60205879T2 (de) 2006-06-08
DE60205879D1 (de) 2005-10-06
BRPI0207581B1 (pt) 2016-05-24
ATE303699T1 (de) 2005-09-15
BR0207581A (pt) 2004-04-27
CA2438599A1 (en) 2002-09-06
EP1374588A1 (fr) 2004-01-02
EP1374588B1 (fr) 2005-08-31
KR20040011464A (ko) 2004-02-05
US20030133571A1 (en) 2003-07-17
CN1494803A (zh) 2004-05-05
ES2248516T3 (es) 2006-03-16
US7212636B2 (en) 2007-05-01
CA2438599C (en) 2011-09-20
KR100850825B1 (ko) 2008-08-06
WO2002069638A1 (fr) 2002-09-06

Similar Documents

Publication Publication Date Title
CN1220384C (zh) 压缩视频流的加密
Long et al. Separable reversible data hiding and encryption for HEVC video
Itier et al. Recompression of JPEG crypto-compressed images without a key
Massoudi et al. Overview on selective encryption of image and video: challenges and perspectives
Lian et al. A novel image encryption scheme based-on JPEG encoding
EP3195519B1 (en) Encoder, decoder and methods employing partial data encryption
Kulkarni et al. Proposed video encryption algorithm v/s other existing algorithms: A comparative study
US8189664B2 (en) Methods for encrypting and compressing video
Soleymani et al. A survey on principal aspects of secure image transmission
Seidel et al. Cryptanalysis of video encryption algorithms
Sallam et al. CABAC-based selective encryption for HEVC using RC6 in different operation modes
Rodrigues et al. Selective encryption of human skin in JPEG images
Barannik et al. A Method of Scrambling for the System of Cryptocompression of Codograms Service Components
Lian et al. Perceptual cryptography on JPEG2000 compressed images or videos
US20060265601A1 (en) Jpeg2000 syntax-compliant encryption with full scalability
Choon et al. Lightweight and cost-effective MPEG video encryption
Alhassan et al. Perceptual video encryption via unit anti-diagonal matrix
Chen et al. An efficient randomly-selective video encryption algorithm
Xu et al. Two-dimensional histogram modification for reversible data hiding in partially encrypted H. 264/AVC videos
Yeung et al. Partial video encryption based on alternative integer transforms
Al-Hazaimeh et al. A novel video encryption algorithm-based on speaker voice as the public key
Mohamed et al. Joint compression-encryption technique based on arithmetic coding for jpeg images
Gbaden A Chaos based image Encryption Scheme using one Dimensional Exponential Logistic Map.
Shang et al. An efficient MPEG video encryption scheme based on chaotic cipher
Kadam et al. Video frame encryption algorithm using AES

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20050921

Termination date: 20190225