SMPTE ST 427-2009 Link Encryption for 1 5 Gb s Serial Digital Interface.pdf
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1、 SMPTE 427-2009Link Encryption for 1.5 Gb/s1Serial Digital Interface 1Nominal total Bit Rate SMPTE STANDARD Page 1 of 34 pages Table of Contents Page Foreword . 3 Intellectual Property 3 1 Scope . 4 2 Conformance Notation . 4 3 Normative References . 4 4 Introduction 5 5 Encryption/Decryption Engine
2、 7 5.1 AES Core and Parallel (12Bit)-Parallel (20-Bit) Converter 7 5.2 Stream Converter . 7 5.2.1 Filling period 8 5.2.2 Active picture period . 8 5.3 Encryption Modulator . 8 5.4 Encryption Demodulator 10 6 Link Encryption Key (LE_Key) . 10 6.1 LE_Key Generation 10 6.2 LE_Key Distribution 10 6.3 LE
3、_Key Change Timing . 10 7 Link Encryption Key Message (LEKM) and Link Encryption Key Payload (LEKP) 11 7.1 Overview 11 7.2 Maximum Recipient Processing Delay for LEKM Updates 12 7.3 Link Encryption Key Message Structure (LEKM) . 12 7.3.1 Algorithm_type 13 7.3.2 LE_Key ID . 13 7.3.3 SHA1_digest . 13
4、7.3.4 LEKP_len 14 7.3.5 ELEKP_len 14 7.3.6 ELEKP_data 14 7.4 Link Encryption Key Payload (LEKP) Structure . 14 7.4.1 Not_valid_after 15 7.4.2 LE_attribute_len 15 7.4.3 LE_attribute_data 15 Copyright 2009 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 1060
5、1 (914) 761-1100 Approved March 11, 2009 SMPTE 427-2009 7.4.4 LE_Key ID . 15 7.4.5 LE_Key_type (Dynamic) 16 7.4.6 LE_Key_len . 16 7.4.7 LE_Key 16 7.5 LEKM Distribution through 1.5 Gb/s Serial Interface(s) . 16 8 AES Input 18 8.1 AES Input Items . 18 8.2 AES Input and Stream Converter Change Timing .
6、 18 8.2.1 Change timing for the first active picture line 18 8.2.2 Change timing for other active picture lines 19 9 Link Encryption Metadata . 21 9.1 Link Encryption Metadata Items 21 9.2 Data Structure of the Link Encryption Metadata 21 9.3 Ancillary Data Specification 22 Annex A Probability of FI
7、FO being Unfilled and Vacant (Informative) . 23 A.1 Probability of FIFO (64 stages) being Unfilled During an Example Filling Period (100 Samples) 23 A.2 Probability of FIFO (64 stages) being Empty During an Example Horizontal Active Picture Period (e.g. 2048 Samples) 23 Annex B System Behavior Under
8、 Error Conditions (Informative) 24 B.1 Repetition of Link Encryption Metadata 24 B.2 Behavior in the Absence of Link Encryption Metadata . 24 B.3 Recovery from Link Loss . 24 B.4 “Hot Switching” Between Program Streams . 24 B.5 Resistance to Line Noise 24 Annex C Consideration of Frame Rates, P, PsF
9、 and I (Informative) . 25 C.1 Frame Rates 25 C.2 Progressive, Progressive Segmented Frame (PsF) and Interlace . 25 Annex D Ancillary Packet Structure of LEKM and Link Encryption Metadata (Informative) 26 Annex E Stream Converter FIFO 1st Write Data at Filling Period and 65th Write Data at Active Pic
10、ture Periods (Informative) 27 Annex F Test Vector Description (Informative) 29 Annex G Index of Acronyms and Terms Used (Informative) 34 Page 2 of 34 pages SMPTE 427-2009 Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recognized standards developing org
11、anization. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 countries on six continents. SMPTEs Engineering Documents, including Standards, Recommended Practices and Engineering Guidelines, are prepared by SMPTEs Technology Committees. Participation in the
12、se Committees is open to all with a bona fide interest in their work. SMPTE cooperates closely with other standards-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Documents are drafted in accordance with the rules given in Part XIII of its Administrative Practices. SMPTE Sta
13、ndard 427 was prepared by Technology Committee DC28. Intellectual Property SMPTE draws attention to the fact that it is claimed that compliance with this Standard may involve the use of one or more patents or other intellectual property rights (collectively, “IPR“). The Society takes no position con
14、cerning the evidence, validity, or scope of this IPR. Each holder of claimed IPR has assured the Society that it is willing to License all IPR it owns, and any third party IPR it has the right to sublicense, that is essential to the implementation of this Standard to those (Members and non-Members a
15、like) desiring to implement this Standard under reasonable terms and conditions, demonstrably free of discrimination. Each holder of claimed IPR has filed a statement to such effect with SMPTE. Information may be obtained from the Director, Standards and Engineering at SMPTE Headquarters. Attention
16、is also drawn to the possibility that elements of this Standard may be subject to IPR other than those identified above. The Society shall not be responsible for identifying any or all such IPR. Page 3 of 34 pages SMPTE 427-2009 1 Scope This Standard defines a method for providing secure transmissio
17、n of digital pictures over a transport conforming to SMPTE 292. Encryption of data in H-ANC and V-ANC data regions is not defined by this standard This document also defines the Link Encryption metadata to synchronize the encryption and decryption processes, and a Link Encryption Key Message to carr
18、y Link Encryption keys for decryption over the 1.5Gb/s interface 2 Conformance Notation Normative text is text that describes elements of the design that are indispensable or contains the conformance language keywords: “shall“, “should“, or “may“. Informative text is text that is potentially helpful
19、 to the user, but not indispensable, and can be removed, changed, or added editorially without affecting interoperability. Informative text does not contain any conformance keywords. All text in this document is, by default, normative, except: the Introduction, any section explicitly labeled as “Inf
20、ormative“ or individual paragraphs that start with “Note:” The keywords “shall“ and “shall not“ indicate requirements strictly to be followed in order to conform to the document and from which no deviation is permitted. The keywords, “should“ and “should not“ indicate that, among several possibiliti
21、es, one is recommended as particularly suitable, without mentioning or excluding others; or that a certain course of action is preferred but not necessarily required; or that (in the negative form) a certain possibility or course of action is deprecated but not prohibited. The keywords “may“ and “ne
22、ed not“ indicate courses of action permissible within the limits of the document. The keyword “reserved” indicates a provision that is not defined at this time, shall not be used, and may be defined in the future. The keyword “forbidden” indicates “reserved” and in addition indicates that the provis
23、ion will never be defined in the future. 3 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this recommended practice. At the time of publication, the editions indicated were valid. All standards are subject to revision,
24、and parties to agreements based on this recommended practice are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. SMPTE 291M-2006, Television Ancillary Data Packet and Space Formatting SMPTE 292-2008, 1.5Gb/s Signal/Data Serial Interface
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