On 07/04/2010, at 8:30 AM, Macs R We wrote:

> 
> On Apr 6, 2010, at 5:12 PM, Ashley Aitken wrote:
> 
>>> If you have full PDF tools you can create an actual digital signature 
>>> field.  The appearance of the field LOOKS like your graphic signature, but 
>>> the contents are similar to a PGP-style signature.
>> 
>> Yes, I am aware of that (well not how it looks because I haven't used 
>> digital signatures with PDFs).
>> 
>> I was just looking today for somewhere to buy a good personal certificate 
>> (name, physical address and email address for example, not just email 
>> address) and on both Verisign and Thawte I couldn't find any thing 
>> resembling that.  It needs to be one of the big CAs that have their 
>> certificates distributed with the major operating systems.
> 
> You don't need a certificate to use these fields.  The process is similar to 
> creating a PGP key pair -- as long as only you know the keyphrase, you own 
> the signature.

I'm not sure it is as easy as that.  

How does someone independently verify that you - and you are actually who you 
say you are - were the one who signed the document?  That, I believe, is the 
whole reason for Public Key Infrastructure.

Cheers,
Ashley.

--
Ashley Aitken
Perth, Western Australia
Skype/iChat: MrHatken (GMT + 8hrs!)

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