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Welcome to the DocIntegrity wiki!

Lembretes sobre certificação

Comando que gera SHA256-double:

• por terminal Linux: openssl dgst -sha256 -binary meuDocumento | openssl dgst -sha256
• por javascript online: https://uniproof.com.br/#doublesha256

Nosso primeiro documento assinado foi a ata de fundação, http://addressforall.org/_private/A4A-colecao2020-04-v6~assinado.pdf

1. Certificação do formato PDF, ver abaixo anexo "PDFchecker report", obtido de https://www.datalogics.com/products/pdf-tools/pdf-checker/

2. Integridade final, se houver registro, https://uniproof.com.br#doublesha256

3. Confira a validade das chaves ICP-Brasil das assinaturas do documento (atualmente não confere timestamp da assinatura). https://pbad.labsec.ufsc.br/icpedu/ ou https://validator.docusign.com/

Fundamentos

• https://e.ufsc.br/2017/07/25/guia-da-certificado-digital-na-ufsc/
• https://e.ufsc.br/ajuda/como-assinar-digitalmente-um-documento-digitalizado-para-dar-confere-com-original/
• Para universidades federais, https://e.ufsc.br/
• Lembrete de que é possível conferir modelo de documento além da assinatura, o que talvez engesse mais do que resolva, vide o caso das receitas médicas https://assinaturadigital.iti.gov.br/

Tutoriais:

• https://support.docusign.com/br/articles/Como-validar-meus-documentos-assinados-digitalmente
• https://e.ufsc.br/2019/08/16/verificador-de-conformidade-de-assinaturas-digitais-na-ufsc/
• ...

---

ANEXO - PDFchecker report

PDF Checker 1.5.0  Copyright 2018-2019 Datalogics, Inc. All Rights Reserved

Tue May  5 12:06:39 2020

JSON Profile: everything.json

Input Document: A4A-colecao2020-04-v6assinado.pdf

File Size: 1.37 MB

<<=CHECKER_SUMMARY_START=>>
general:born-digital
general:contains-signature
userdata:contains-annots
userdata:contains-annots-not-for-printing
userdata:contains-transparency
fonts:uses-base14fonts-not-embedded
images:color:resolution-too-low
images:grayscale:resolution-too-low
sizeInBytes:1433021
canBeOptimized
<<=CHECKER_SUMMARY_END=>>

Optimization Assessment
    Document can be optimized with PDF Optimizer - see details below

General Results
    Errors:
        None
    Information:
        Document was born digital.  It was produced from PDF authoring software and so it may contain text, images, tables, forms, and other objects.  These types of PDFs typically do not require OCR.
        Signed document
    Checks Completed:
        born-digital
        claims-pdfa-conformance
        claims-pdfe-conformance
        claims-pdfua-conformance
        claims-pdfvt-conformance
        claims-pdfx-conformance
        contains-owner-password
        contains-signature
        damaged
        image-only
        password-protected
        pdf-v2
        unable-to-open
        xfa-type

Userdata Results
    Errors:
        None
    Information:
        Contains annotations: 
            SubType: Link (105 instances)
            SubType: Widget (3 instances)
        Contains annotations that are set as invisible for printing: 
            SubType: Link (105 instances)
        Contains transparency: 
            Total: (3 instances)
    Checks Completed:
        contains-annots
        contains-annots-not-for-printing
        contains-annots-not-for-viewing
        contains-annots-without-normal-appearances
        contains-embedded-files
        contains-metadata
        contains-optional-content
        contains-private-data
        contains-transparency
    How To Optimize:
            Annotations can be removed using PDF Optimizer to save space. (108 instances)
            Annotations not intended for printing can be removed using PDF Optimizer to save space. (105 instances)
            Transparency (which is not universally supported by PDF Viewers) can be flattened using PDF Optimizer. (3 instances)

Fonts Results
    Errors:
        Uses Base 14 fonts not embedded in document: 
            Helvetica (3 instances)
    Information:
        None
    Checks Completed:
        fontdescriptor-missing-capheight
        fontdescriptor-missing-fields
        uses-base14fonts-not-embedded
        uses-fonts-fully-embedded
        uses-fonts-not-embedded

Objects Results
    Errors:
        None
    Information:
        None
    Checks Completed:
        contains-javascript-actions
        contains-thumbnails

Cleanup Results
    Errors:
        None
    Information:
        None
    Checks Completed:
        suboptimal-compression

Image Results
    Errors:
        None
    Information:
        None
    Checks Completed:
        alternate-images

    Color Images
    Errors:
        None
    Information:
        Low resolution color image(s) present: 
            Total: (8 instances)
    Checks Completed:
        image-depth
        resolution-too-high
        resolution-too-low
        uses-jpeg2000-compression

    Grayscale Images
    Errors:
        None
    Information:
        Low resolution gray image(s) present: 
            Total: (6 instances)
    Checks Completed:
        resolution-too-high
        resolution-too-low
        uses-jpeg2000-compression

    Monochrome Images
    Errors:
        None
    Information:
        None
    Checks Completed:
        resolution-too-high
        resolution-too-low
        uses-jbig2-compression