Question

I have a requirement, where we need to make sure that the document [PDF] we recieved electronically is same as the one we sent out.

ours is a document exchange company and we recieve and send lot of documents from and to out side, some times user have to send documents to us which we have sent them before, we want to make sure that the document is same and no changes were made by using some tools like photoshop or pdf editor.

One way i see is compare each byte, but not sure if we have any other tools..?

our project built using .Net 3.5, VB

Any help will be great

Thank you
Venu

Answer 1

You could extract all the content to a txt file with Ghostscript and pstotext and then operate on the txt file.(sizeof, diff, etc.). Or maybe adopt digital signature?