UELMA - Exploring Authorization Options 
Components of a Solution 
File Type Considerations 
Signing Software 
Validation Software 
Xcential Group, LLC 
Convert pdf picture to text - Convert PDF to txt files in C#.net, ASP.NET MVC, WinForms, WPF application
C# PDF to Text (TXT) Converting Library to Convert PDF to Text
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Convert pdf picture to text - VB.NET PDF Convert to Text SDK: Convert PDF to txt files in vb.net, ASP.NET MVC, WinForms, WPF application
VB.NET Guide and Sample Codes to Convert PDF to Text in .NET Project
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UELMA - Exploring Authorization Options 
1. File Type Considerations 
Some Files Support Embedded Signatures 
PDF, some word processing formats 
External Signatures & Envelopes 
Any file format can have detached signature 
Validation highly inconvenient 
Anything goes into a signed envelope 
Slightly less inconvenient (can't lose sig) 
PDF can be a signed envelope 
Automated Validation 
PDF Only 
Xcential Group, LLC 
C# PDF insert image Library: insert images into PDF in C#.net, ASP
How to Insert & Add Image, Picture or Logo on PDF Page Using C#.NET. Import graphic picture, digital photo, signature and logo into PDF document.
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VB.NET TIFF: How to Draw Picture & Write Text on TIFF Document in
New RaterEdgeDrawing() drawing.Picture = "RasterEdge" drawing New RaterEdgeDrawing() drawing.Text = "RasterEdge" drawing imaging controls, PDF document, tiff
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UELMA - Exploring Authorization Options 
2. Certificates – Who signed it? 
Nobody trusts it! → Need trusted distribution (e.g. secure web site) 
Well-known CA (PKI) 
Not free 
Various purposes, levels of assurance, prices 
VeriSign, GeoTrust, Entrust, GlobalSign 
CDS Certificate 
Automatically trusted by Adobe Reader 
Requires hardware support 
Xcential Group, LLC 
C# Word - Paragraph Processing in C#.NET
and text for endnote content IRun endnRun = endnPara.CreateARun(); endnRun.CreateText(" Endnote created!"); /Save the document doc0.Save(@""). Create Picture
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VB.NET Image: Visual Basic .NET Guide to Draw Text on Image in .
for drawing text on a local picture with Visual RasterEdge.com", DrawFont, DrawBrush, DrawPoint) Text.Save(). & profession imaging controls, PDF document, image
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UELMA - Exploring Authorization Options 
3. Signing Software 
Desktop PDF 
Standard Programming Libraries 
Adobe LiveCycle 
Xcential Group, LLC 
VB.NET Image: Image Resizer Control SDK to Resize Picture & Photo
NET image drawing application to draw text & graphics NET Method to Resize Image & Picture. Here we powerful & profession imaging controls, PDF document, image
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VB.NET Image: Image Cropping SDK to Cut Out Image, Picture and
first! VB.NET Image & Picture Cropping Application. Do you need to save a copy of certain part of an image file in a programming way?
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UELMA - Exploring Authorization Options 
Desktop PDF Signing Apps 
Adobe Acrobat, Aloaha PDF Signator 
PDF only 
Low cost, unless many copies needed 
Any kind of certificate 
Including hardware tokens 
Fully manual signing 
Open PDF, sign and save 
Aloaha has batch mode, scripting capability 
Xcential Group, LLC 
VB.NET Image: Image Scaling SDK to Scale Picture / Photo
VB.NET DLLs to Scale Image / Picture. There are two dlls that will be involved in the process of VB.NET image scaling, which are RasterEdge.Imaging.Basic.dll
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C# TIFF: How to Insert & Burn Picture/Image into TIFF Document
Support adding image or picture to an existing or new creating blank TIFF are dedicated to provide powerful & profession imaging controls, PDF document, tiff
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UELMA - Exploring Authorization Options 
Standard Programming Libraries 
Java, MS-CAPI, .NET, etc. 
Crypto algorithms, certificate handling 
XML DSig implementations 
Not applications => custom software needed to use 
“Free” => cost is in developing app 
Can be used to sign XML, HTML, anything 
But not embedded PDF signatures 
Can validate same 
Xcential Group, LLC 
VB.NET Image: VB.NET Planet Barcode Generator for Image, Picture &
a document file (supported files are PDF, Word & size, foreground color, the background color, text font and Generate Planet Barcode on Picture & Image in VB
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VB.NET PDF insert image library: insert images into PDF in vb.net
Import graphic picture, digital photo, signature and As String = Program.RootPath + "\\" 1.pdf" Dim doc PDFDocument(inputFilePath) ' Get a text manager from
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UELMA - Exploring Authorization Options 
Programming library for PDF documents 
Not an application => custom software needed to use 
Free (open source) and paid versions 
Any kind of certificate 
Including hardware tokens (to be confirmed) 
Suitable for automated mass signing 
Xcential Group, LLC 
UELMA - Exploring Authorization Options 
Adobe LiveCycle ES 2 
Large server-side application 
“Digital Signatures” is one module 
PDF only 
CDS certificates 
Supports HSMs 
Fully automated mass signing 
Xcential Group, LLC 
UELMA - Exploring Authorization Options 
4. Validation Software 
PDF Readers 
Hash Comparators  
Signature Validation Libraries 
Online Services (Austria, MN) 
Xcential Group, LLC 
UELMA - Exploring Authorization Options 
PDF Readers 
Adobe Reader 
Automatically validates signed PDFs 
Trusts certificates tracing back to: 
Adobe Root (Reader v6 & up) 
Any root cert in AATL (Reader v9 and up) 
(at user option) Any cert in Windows cert store 
Free, highly convenient, proprietary 
Foxit Reader 
User activates signature validation 
Seems to trust only certs in Windows store 
Free, slightly less convenient, bug encountered 
Xcential Group, LLC 
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