[Cialug] touch screen devices

[Tim Champion]

I've looked into things like this, and thinking about the level of security
it brings.  I always make the devils-advocate argument that once a signature
is captured electronically, and that signature is tied to one document, what
is to prevent someone who has the skills and "rights" to the database from
taking that stored image, and fraudulently applying it to another document
that the person did not sign?

In thinking further, it should be that no 2 signature images are exactly
alike, so it should be possible to compare the stored images and make sure
that each image is only applied once -- using a unique key in a database for
example? Can a BLOB (Binary Large OBject) be marked unique?  *ponders*

making a copy of an electronic signature is akin to forging a signature, I
guess.  The other idea we are starting to look at is using facial
recognition (from the camera on a tablet) to do things like taking
attendance in a classroom - in our case...

The "original signature" issue is the #1 biggest hang-up for is in moving to
a paperless environment, so this subject is of great interest to me.

Tim Champion
timchampion at gmail.com


On Thu, Oct 27, 2011 at 11:59 AM, Matthew Nuzum <newz at bearfruit.org> wrote:

> I used a "Square" device that used signing with your fingertip. It felt
> weird. It was a native app, not a web app though.
>
> It's possible to draw. For example, I just tested with Khan Academy: if you
> go to the site and it's the mobile, hit the button on the bottom to switch
> to desktop, then click to do a practice, then click one (addition 1 for
> example) then hit "Show scratchpad" and you can draw all you like. This must
> be using Canvas.
>
> I have no idea how you can submit it though. I don't know if it's possible
> to grab the image data... (looking...)
>
> Looks like, according to this you can:
> http://www.nihilogic.dk/labs/canvas2image/
>
> canvas.toDataUrl() base64 encodes the image as a png which you should be
> able to send to the server using ajax.
>
> Slick idea.
>
>
> On Thu, Oct 27, 2011 at 11:32 AM, Dave Hala Jr <dave at 58ghz.net> wrote:
>
>> Has anyone done any signature capture with a touchscreen device such as
>> an ipad or a smartphone from inside a web page?
>>
>> :) Dave
>>
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>
> --
> Matthew Nuzum
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