1、 ETSI TS 102 778-6 V1.1.1 (2010-07)Technical Specification Electronic Signatures and Infrastructures (ESI);PDF Advanced Electronic Signature Profiles;Part 6: Visual Representations of Electronic SignaturesETSI ETSI TS 102 778-6 V1.1.1 (2010-07)2Reference DTS/ESI-000085-6 Keywords e-commerce, electro
2、nic signature, security, PAdES ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copie
3、s of the present document can be downloaded from: http:/www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (P
4、DF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status
5、 of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except
6、as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2010. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTM, TIPHONTM, the TIPHON logo and the ETSI logo are Trade Marks of ETSI registered
7、 for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. LTE is a Trade Mark of ETSI currently being registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are T
8、rade Marks registered and owned by the GSM Association. ETSI ETSI TS 102 778-6 V1.1.1 (2010-07)3Contents Intellectual Property Rights 4g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g32.1 Normative references . 5g32.2 Informative references 6g33 Definitions and abbreviations . 6g33.1 Defin
9、itions 6g33.2 Abbreviations . 7g34 General concepts 7g35 The signature appearance . 8g35.1 Recommended information in signature appearances 8g35.2 Encoding of signature appearances in PDF 9g36 The visual representation of AdES signature verification 10g36.1 The visual representation of individual Ad
10、ES signature verification . 10g36.2 Summary representation of certified identity verification 11g36.3 Detailed representation of AdES signature verification . 11g36.4 The visual representation of the document timestamp verification 12g3History 13g3ETSI ETSI TS 102 778-6 V1.1.1 (2010-07)4Intellectual
11、 Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPR
12、s); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searc
13、hes, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produce
14、d by ETSI Technical Committee Electronic Signatures and Infrastructures (ESI). The present document is part 6 of a multi-part deliverable. Full details of the entire series can be found in part 1 2. Introduction Electronic documents are a major part of a modern companies business. Trust in this way
15、of doing business is essential for the success and continued development of electronic business. It is, therefore, important that companies using electronic documents have suitable security controls and mechanisms in place to protect their documents and to ensure trust and confidence with their busi
16、ness practices. In this respect the electronic signature is an important security component that can be used to protect information and provide trust in electronic business. The present document covers visual aspects of electronic signatures for electronic documents. This includes the appearance of
17、signatures within the document and evidence as to its validity even if the signer or verifying party later attempts to deny (i.e. repudiates; see ISO/IEC 10181-4 i.1) the validity of the signature. Thus, the present document can be used for any document encoded in a Portable Document Format (PDF) pr
18、oduced by an individual and a company, and exchanged between companies, between an individual and a governmental body, etc. The present document is independent of any environment; it can be applied to any environment, e.g. smart cards, GSM SIM cards, special programs for electronic signatures, etc.
19、The European Directive on a community framework for Electronic Signatures defines an electronic signature as: “Data in electronic form which is attached to or logically associated with other electronic data and which serves as a method of authentication“. The present document applies to visual repre
20、sentations of advanced electronic signatures as defined in the Directive 8. ISO 32000-1 1 specifies a digital form for representing documents called the Portable Document Format (PDF) that enables users to exchange and view electronic documents easily and reliably, independent of the environment in
21、which they were created or the environment in which they are viewed or printed. ISO 32000-1 1 identifies the ways in which an electronic signature, in the form of a digital signature, may be incorporated into a PDF document to authenticate the identity of the user and validate integrity of the docum
22、ents content. This includes a means for visually representing the signature within the document. This “signature appearance“ by convention often includes information identifying the signatory, but as it is not currently verified by the AdES signature does not in itself authenticate this identity. ET
23、SI ETSI TS 102 778-6 V1.1.1 (2010-07)51 Scope The present document specifies requirements and recommendations for the visual representations of advanced electronic signatures (AdES) in PDFs. This covers: a) Signature appearance: The visual representation of the human act of signing placed within a P
24、DF document at signing time and linked to an advanced electronic signature; and b) Signature verification representation: The visual representation of the verification of an advanced electronic signature. The aim of the present document is to provide requirements and recommendations for signature ap
25、pearances and the visual representation of advanced electronic signatures. This is particularly aimed to help the untrained human understanding of the signature and to further consistency between the signature appearance and the visual representations of the AdES verification in order to help human
26、comparison. The present document includes further explanation of the two different visual representations of electronic signatures related to PDF. The present document does not cover printable forms of signature values (e.g. using barcodes) which may be verifiable from the printed document. NOTE: Th
27、is use of printable forms of signature value is to be covered in a separate report. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific refer
28、ences, the latest version of the referenced document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the
29、time of publication ETSI cannot guarantee their long term validity. 2.1 Normative references The following referenced documents are necessary for the application of the present document. 1 ISO 32000-1: “Document management - Portable document format - Part 1: PDF 1.7“. 2 ETSI TS 102 778-1: “Electron
30、ic Signatures and Infrastructures (ESI); PDF Advanced Electronic Signature Profiles; Part 1: PAdES Overview - a framework document for PAdES“. 3 OASIS: “Profile for Comprehensive Multi-signature Verification Reports for OASIS Digital Signature Services Version 1.0“. 4 IETF RFC 3709: “Internet X.509
31、Public Key Infrastructure: Logotypes in X.509 Certificates“. 5 IETF draft-ietf-pkix-certimage-04: “Internet X.509 Public Key Infrastructure - Certificate Image“. NOTE: Available at http:/tools.ietf.org/html/draft-ietf-pkix-certimage-04. 6 IETF RFC 3739: “Internet X.509 Public Key Infrastructure: Qua
32、lified Certificates Profile“. 7 ISO 19005-1 (2005): “Document management - Electronic document file format for long-term preservation - Part 1: Use of PDF 1.4 (PDF/A-1)“. ETSI ETSI TS 102 778-6 V1.1.1 (2010-07)68 Directive 1999/93/EC of the European Parliament and of the Council of 13 December 1999
33、on a Community framework for electronic signatures. 9 IETF RFC 3852: “Cryptographic Message Syntax (CMS)“. 10 ETSI TS 102 778-3: “Electronic Signatures and Infrastructures (ESI); PDF Advanced Electronic Signature Profiles; Part 3: PAdES Enhanced - PAdES-BES and PAdES-EPES Profiles“. 2.2 Informative
34、references The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 ISO/IEC 10181-4 (1997): “Information technology - Open Systems Interconnection - Security frameworks for open systems: No
35、n-repudiation framework“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in 1 and the following apply: certificate image: image that is part of a X509 certificate as specified in draft-ietf-pkix-certimage-04 5 certified ident
36、ity: information about the signer certified by a trusted source claimed signing time: time of signing claimed by the signer which on its own does not provide independent evidence of the signing time conforming signature handler: software application, or part of a software application, that knows how
37、 to perform digital signature operations (e.g. signing and/or verifying) in conformance with ISO 32000-1 1 and the requirements of the appropriate profile off page display: information displayed by a conforming signature handler that is unmistakable separated from the page content of a PDF document
38、PDF Signature: binary data object based on the CMS (RFC 3852 9) or related syntax containing a digital signature placed within a PDF document structure as specified in ISO 32000-1 1 clause 12.8 with other information about the signature applied when it was first created signature dictionary: PDF dat
39、a structure, of type dictionary, as described in ISO 32000-1 1, clause 12.8.1, Table 252 that contains all the information about the Digital Signature signer: entity that creates an electronic signature validation data: data that may be used by a verifier of electronic signatures to determine that t
40、he signature is valid (e.g. certificates, CRLs, OCSP responses) verifier: entity that validates an electronic signature signature appearance: visual representation of the human act of signing placed within a PDF document at signing time and linked to an advanced electronic signature signature verifi
41、cation representation: visual representation of the verification of an advanced electronic signature The present document makes use of certain keywords to signify requirements. Below follows their definitions: may: means that a course of action is permissible within a profile shall: means that the d
42、efinition is an absolute requirement of a profile NOTE: It has to strictly be followed in order to conform to the present document. ETSI ETSI TS 102 778-6 V1.1.1 (2010-07)7should: means that among several possibilities one is recommended, in a profile, as particularly suitable, without mentioning or
43、 excluding others, or that a certain course of action is preferred but not necessarily required NOTE: Implementers may know valid reasons in particular circumstances to ignore this recommendation, but the full implications must be understood and carefully weighed before choosing a different course.
44、3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: AdES Advanced Electronic Signature (as specified in Directive 1999/93/EC 8) AP Appearance Dictionary CMS Cryptographic Message Syntax (as specified in RFC 3852 9) CN Common Name CRL Certificate Revocation
45、List FT Field Type OCSP Online Certificate Status Protocol PAdES PDF Advanced Electronic Signature PDF Portable Document Format 4 General concepts An advanced electronic signature (AdES) included within an electronic document is based on a sequence of bytes obtained by applying a cryptographic algor
46、ithm, and serving to protect the integrity of the electronic document as well as the identity of the signatory. Signatures that can be applied to a PDF document, as described in ISO 32000-1 1 and other parts of this multi-part document, are referenced to as a PDF Signature. PDF (ISO 32000-1 1) also
47、includes features to represent electronic signatures in a human understandable way as part of the human readable and printable content. This is referred to in the present document as the signature appearance (as implemented by the value of the AP key in a widget annotation dictionary of a signature
48、field in ISO 32000-1, section 12.7.5.4 1) A signature appearance is linked to an AdES which it represents. It can include information identifying the signer (e.g. textual name and/or graphical image of a signature or logo) as separately authenticated by the advanced electronic signature, as well as
49、other information about the signature such as time, reason and location. Some of this information may be extracted by the conforming signature handler from the X509 certificate. The time will be a claimed signing time which may differ from the signature time-stamp which is applied subsequently. The content and appearance of the signature appearance is under the control of the signer and is “sealed“ by the advanced electronic signature (digital signature). The signature appearance is created by the signer and any identifi
