Encryption/Decryption of Image files - AndreaVB Visual Basic and VB.NET source code discussion board

Previous Topic (Mapi and digital signature)

AndreaVB Forum : VB General : Encryption/Decryption of Image files

Poster

Message

tmg
Level: Guest

Encryption/Decryption of Image files

I am building an application that is using many .htm web pages with embedded .jpg images as links.
I am trying to find a way to encrypt those .jpg images (many utilities can do so), and when opened by my vb application they will be temporarily Decrypted for the duration of the viewing on screen , or while in use by my program, while the source is left encrypted as it is so that it CAN NOT be viewed by any viewer or program except the visual basic application that I am using.
ANother way of putting it is that I am trying to write my own format for those graphics files so that they can not be used except by the vb application that I have written.

Anybody has any suggestions on how to do this ?

10-09-2003 at 10:59 PM

vbgen
Level: Moderator

Registered: 10-10-2002
Posts: 876

Re: Encryption/Decryption of Image files

well, for now i can tell you that one way is to open the file binarily, then add some strings and numbers to encrypt it.

it's not a very good way, but it's a start, right?

____________________________
Been busy trying to take a second degree <--it's not working out...

11-09-2003 at 06:03 PM

JLRodgers
Level: Moderator

Registered: 04-04-2002
Posts: 1617

Re: Encryption/Decryption of Image files

Just so you know, which I'm sure you do. A screenshot will still show the graphic, so it'll only make it more difficult not impossible to get the graphic.

____________________________
Everywhere's Local (classifieds, job postings, & more for everycity in the world - user entered)

11-09-2003 at 07:05 PM

tmg
Level: Guest

Re: Encryption/Decryption of Image files

quote:
vbgen wrote:
well, for now i can tell you that one way is to open the file binarily, then add some strings and numbers to encrypt it.

it's not a very good way, but it's a start, right?

Thank you for your response .
I tried that , but I am unable to "Decrypt" the file.
Any suggestions where I can find sample programs or better documentation to use the binary read and write ?

11-09-2003 at 09:28 PM

tmg
Level: Guest

Re: Encryption/Decryption of Image files

quote:
JLRodgers wrote:
Just so you know, which I'm sure you do. A screenshot will still show the graphic, so it'll only make it more difficult not impossible to get the graphic.

Agreed, however if someone is willing to spend the time to screen capture ALL of the image files that are being used, then it is an effort that should be well rewarded. I estimate that I will have about 6-8 thousand image files.

11-09-2003 at 09:30 PM

AndreaVB Forum : VB General : Encryption/Decryption of Image files


	Surf To:



	AndreaVB Visual Basic and VB.NET source code resources - Copyright © 1999-2007 Andrea Tincani