Discussion Regarding Digital Signatures

Discussion Regarding Digital Signatures
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Discussion Regarding Digital Signatures Ari 08-01-2007
Posted by Ari on August 1, 2007, 1:12 pm
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There are many digital signature products on the market but they appear
to be overkill for a project I have due very soon. The project requires
that a digital signature be applied to an authorization of an e-form
(Request by a non commissioned officer) by his superior or superiors.

By "digital signature", the requirements are:

1) that a physical "mark" appear and
2) that the digital signature protects the document from tampering
(invalidates it if tampered with will do)

When the Request is printed, that mark should also appear.

Adobe PDF would be useable but it does require that a digital signature
be applied manually. This is problematic for the User base, an automated
solution must be sought.

I am wondering if the best approach would be to find an existing, open
source, with code and write the automating functions ourselves.

Comments are appreciated.
--
"You can't trust code that you did not totally create yourself"
Ken Thompson "Reflections on Trusting Trust"
http://www.acm.org/classics/sep95/

Posted by Jim Watt on August 1, 2007, 5:09 pm
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wrote:

>There are many digital signature products on the market but they appear
>to be overkill for a project I have due very soon. The project requires
>that a digital signature be applied to an authorization of an e-form
>(Request by a non commissioned officer) by his superior or superiors.
>
>By "digital signature", the requirements are:
>
>1) that a physical "mark" appear and
>2) that the digital signature protects the document from tampering
>(invalidates it if tampered with will do)
>
>When the Request is printed, that mark should also appear.
>
>Adobe PDF would be useable but it does require that a digital signature
>be applied manually. This is problematic for the User base, an automated
>solution must be sought.
>
>I am wondering if the best approach would be to find an existing, open
>source, with code and write the automating functions ourselves.
>
>Comments are appreciated.

PGP provides a mechanism for signing documents, however if you are
lookin at an 'automatic' method of signing documents, thats rather the
same as using a rubber stamp as a conventional signature.

ie without the necessary personal intervention and trust.
--
Jim Watt
http://www.gibnet.com

Posted by Luca T. on December 25, 2007, 9:40 pm
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Ari wrote:
> There are many digital signature products on the market but they appear
> to be overkill for a project I have due very soon. The project requires
> that a digital signature be applied to an authorization of an e-form
> (Request by a non commissioned officer) by his superior or superiors.
>
> By "digital signature", the requirements are:
>
> 1) that a physical "mark" appear and
> 2) that the digital signature protects the document from tampering
> (invalidates it if tampered with will do)
>
> When the Request is printed, that mark should also appear.
>
> Adobe PDF would be useable but it does require that a digital signature
> be applied manually. This is problematic for the User base, an automated
> solution must be sought.
>
> I am wondering if the best approach would be to find an existing, open
> source, with code and write the automating functions ourselves.
>
> Comments are appreciated.

Begin here:
http://sourceforge.net/project/showfiles.php?group_id=67103&package_id=188602

Bye,
Luca

Posted by Ari on December 27, 2007, 1:14 am
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On Wed, 26 Dec 2007 03:40:05 +0100, Luca T. wrote:

> Ari wrote:
>> There are many digital signature products on the market but they appear
>> to be overkill for a project I have due very soon. The project requires
>> that a digital signature be applied to an authorization of an e-form
>> (Request by a non commissioned officer) by his superior or superiors.
>>
>> By "digital signature", the requirements are:
>>
>> 1) that a physical "mark" appear and
>> 2) that the digital signature protects the document from tampering
>> (invalidates it if tampered with will do)
>>
>> When the Request is printed, that mark should also appear.
>>
>> Adobe PDF would be useable but it does require that a digital signature
>> be applied manually. This is problematic for the User base, an automated
>> solution must be sought.
>>
>> I am wondering if the best approach would be to find an existing, open
>> source, with code and write the automating functions ourselves.
>>
>> Comments are appreciated.
>
> Begin here:
> http://sourceforge.net/project/showfiles.php?group_id=67103&package_id=188602
>
> Bye,
> Luca

Focus on Italian CAs?

Posted by Eugene Mayevski on December 27, 2007, 4:53 am
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Hello!
You wrote on Wed, 26 Dec 2007 03:40:05 +0100:

A> Adobe PDF would be useable but it does require that a digital
A> signature be applied manually. This is problematic for the User base,
A> an automated solution must be sought.
??>> ??>> I am wondering if the best approach would be to find an
??>> existing, open source, with code and write the automating functions

Don't know about automation, but if you can do some coding, you can check
PDFBlackbox ( http://www.eldos.com/sbb/desc-pdf.php ), it can be used to
apply the signature and it doesn't require Acrobat. You can also use Acrobat
SDK, but you would need to have Acrobat installed on the system where you do
signing. PDFBlackbox is more practical from this point of view.

With best regards,
Eugene Mayevski


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