Apex: How do you capture a digital signature?

My first post:
Can someone show me how to obtain the digital signature from a CAC card?
Appreciate a fast response! :0)
Edited by: 846623 on Mar 24, 2011 10:52 PM

I have the same requirements. What did you do?
From what I gathered you have to require client certificates and IE will handle validating the CAC password and then add something to the header of the page. I am not sure what though and I do not have access to firebug on my current computer to figure it out.
Thanks

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How can you verify the digital signature inside a form?

I see Adobe has a separate solution called Echosign but how to use both forms and signature together?

Hi,
this is indeed possible.
You can check if the change value is larger than one character.
If so, the change value is pasted from the clipboard.
All you need is to add this Script (FormCalc) to the change event of your field.
if (Len($event.change) gt 1) then
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How do I delete a digital signature field?

I have Adobe Acrobat Pro 9 on Snow Leopard. I created a digital signature for a PDF file but it didn't look good, so I decided to delete it. I figured out how to delete the signature, but the signature field with the little red arrow did not delete with my signature. I want my PDF form to revert to the way it was before I created the signature. I cannot simply close the PDF without saving because I'd lose all the information I've already entered. Stupid me forgot to save before attempting the digital signature.
HOW CAN I DELETE the digital signature field? Help!

Hi SM,
The place to look for permission settings is on the Security tab of the Document Properties dialog. You can get there by selecting the File > Properties menu item and then select the Security tab.
One thing to note is if the file is Reader Enabled you will need to use the File > Save a Copy menu item to create a non-Reader enabled version of the file. You cannot edit a Reader Enabled file. As an aside, the Save a Copy menu item won't be there if the file is not Reader Enabled.
If the file was created using Designer (which is only on Windows and I know you are using a Mac) then it has to be edited in Designer.
If the file was certified, then you need to remove (clear) the certifying signature before you can edit the file, and to do that you must have access to the private key that was used as part of that signature operation.
Finally, if the file is encrypted (e.g. Password Security or Certificate Security), you can edit the file, but you have to get Acrobat to realize you are the document owner which means you need the Permissions password or or logged in using a document owners digital ID (the former is only for Password Security and the latter is only for Certificate Security).
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In Adobe X Pro, how do I create a digital signature in my document so that my receiver is able to sign it electronically.

In Adobe X Pro, how do I create a digital signature in my document so that my receiver is able to sign it electronically.

If the other person will be using Reader, you should first add a digital signature field and then Reader enable the form. In Acrobat 10 you'd select: Tools > Forms > Edit
to get into form editing mode. You'd then select the signature field tool to add a signature field.
Once you have the document finalized, Reader-enable the document by selecting: File > Save As > Reader-Extended PDF > Enable Additional Features
being sure to save to a new file so you don't overwrite the original. If you don't Reader-enable, Reader users won't be able to digitally sign.

How to export & reconstruct a digital signature

I would like to submit a reader-enabled pdf form with a digital signature from within a browser.
I'm currently using CoSign Digital Signature to successfully create the signature. I have created a test form with Acrobat X Pro and assigned the "Submit a Form" action to the submit button. The form is configured to submit to a perl cgi, with the Export Format set to FDF with the following settings...
- Field Data
- Incremental changes to the PDF
The post data is received as the POSTDATA parameter and printed back to the browser as content-type: application/vnd.fdf. However, when the fdf is printed back to the browser the digital signature is not included in the signature field. The rest of the form is populated successfully. If I log the POSTDATA value, I can see what appears to be the digital signature.
According to the Adobe docs...
"FDF Exports as an FDF file. You can select one or more of the available options: user-entered data, comments, and incremental changes to the PDF file. The Incremental Changes To The PDF option is useful for exporting a digital signature in a way a server can easily read and reconstruct."
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You can't sign a blank document simply by importing an FDF. The data is in the FDF, but the appened saves (aka incremental change) would have to be extracted from the FDF (e.g., using the no longer supported FDF Toolkit) and then concatenated with the original blank form that was used by the person who filled-in and signed. I can't say for sure this will work any more anyway as Acrobat/Reader has changed the way this works and does a Save As (as opposed to Save) when a document is signed, so there is no incremental change data any longer.

How to create table and digital signature ?

Hello,
I would like to ask two questions regarding SAP interactive forms by adobe.
1st question:
How to create table in interactive form?
Table that i can add rows and column and will show it in the form.
Example the rows and columns that i want:
ID: Name: DOB:
1 Jack 01/02/80
2 Ivy 10/12/82
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How to create digital signature ?
I'm creating a adobe forms which need employee to sign on the form. I use signature field at my form. However, i don't know how to create a new signature and insert in the signature field.
Can any one provide the answer with step by step guide?
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Hi Pradeepa,
you said you have your digital signature in
BMP format? That means Bitmap and would mean you are actually talking about a picture! THIS IS NOT A DIGITAL SIGNATURE!
A digital signature is a cryptographic key (aka public key cryptography) that is used to digitally sign a document, or at least a hash value derived from the document. Digitally signing means, applying the key in a well defined way (this is the algorithm used) to the document or hash value. You do this with your private key and the receiver of the document can then use your public key (which you can distribute in any way you want, even unsecure) to unencrypt the hash value. If this succeeds the receiver knows that the document was signed by you.
This is because both keys are mathematically related in such a way, that what one key encrypted can only be decrypted by the corresponding other key and by no other key. You even can´t decrypt a document with the same key it was encrypted with, this is the difference to symmetric encryption - please have a look at help.sap.com and search for digital signatures.
The named formats (afs, pfx and p12) are ways of coding the key, together with information about your person, such as email address and information about validity of the key into a
certificate. This type of certificate is then called a x.509 certificate and is the same you might have seen when connecting to a secure webserver such as the one of your bank website.
Signing a form with such a certificate provides for mathematically and therefore business related proove of a users identity.
In case you are really using a bitmap, this cannot work and would not serve you any good.
Ask yourself this question: I want to make sure that the form was signed by a specific person. How can I make sure that the signing can only be done by the person pretending to have done so?
A bitmap contains a picture, probably of the persons handwritten signature. How can I make sure that this picture was NOT recreated in MS Paint or Photoshop by someone else?
The answer is:
you can't! Therefore this way of prooving identity is useless.
You need to provide your users with digital signatures, put these in the certificate cache of your IE. If a user then clicks on the signing field, the private key is used to digitally sign the form - create a hash value of the form and encrypt it with the private key. After the form is send back to the server or you, you use the corresponding public key to decrypt the hash value and, as said above, if this succeeds, identity of the signer is proven.
THIS IS AN OVERSIMPLIFICATION! You might want to take a look at Adobe Reader Credentials.
Regards,
 Christian

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Thanks.
Could you explain a little more?
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Should I use Runtime.getRuntime().exec() or Runtime.exec() for something like this?
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Location - Dhaka | Bangladesh - Standard Time Zone: GMT/UTC + 06:00 hour
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Apex: How do you capture a digital signature?

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