Results 1 to 4 of 4

Thread: Increasing Digital Noise..?

  1. #1
    Junior Member
    Join Date
    Sep 2010
    Posts
    1

    Increasing Digital Noise..?

    Is there a way to increase digital noise imprinted on a digital photograph?

    Say some rat is walking around the office. Some employee leaves a sensitive document up on their computer while getting coffee, and the rat snaps a photo of it with his iPhone.

    ---

    Just wondering if I could increase the noise in the picture, but still have it be readable to the naked eye on the monitor.

  2. #2
    Junior Member
    Join Date
    Apr 2011
    Posts
    3
    The first thing you'll want to do is remove the EXIF data. As for noise, programs like GIMP have noise generators which are random enough. Save it to/through a bunch of programs and formats, scale it up and down, and do some crops and what not and you'll probably be good.

    As a note: very few adversaries have the capabilities to find out the device that took a picture after you remove the EXIF data and scale it down.

  3. #3
    Senior Member
    Join Date
    Mar 2008
    Posts
    262
    If you are on the other side of the street, there is nothing you can do to a display to prevent a readable photo of it other than preventing recording equipment such as cell phones and cameras from entering the facility.

  4. #4
    Senior Member nihil's Avatar
    Join Date
    Jul 2003
    Location
    United Kingdom: Bridlington
    Posts
    17,188
    Hmmmm...........

    Seems to me that the question is rather like banging your head against a wall and taking aspirin for the headache?

    My answer would be:

    1. Instant dismissal.
    2. Access control and scanning for illicit electronic devices.

    Also, if you use a recent version of Windows you can easily bring up a password protected screensaver when you leave your workstation?

    Hell, where I worked you had to log out, power off and put the removable HDD into an MoD approved locked cabinet.............. you soon learned to bring a kettle and percolator

    EDIT:

    I think that I see where the idea has come from?....... I am sure that somewhere (probably on a 486) I have some anti-TEMPEST fonts. These were supposed to thwart TEMPEST remote surveillance of CRT monitors because they were somewhat blurred and apparently very "noisy".

    Well, that technology goes back to b&w TVs and reel to reel tape decks, and I do not believe that it is relevant today.

    I'll go with ua549, if you can read it, so can a camera.............you have to look at other security measures like restricted access and securing sensitive information when not physically controlled by security cleared personnel.
    Last edited by nihil; October 23rd, 2011 at 09:28 PM.

Similar Threads

  1. ANALOGUE & DIGITAL DATA TRANSMISSION: Revised
    By Konshuss in forum Other Tutorials Forum
    Replies: 0
    Last Post: January 10th, 2007, 06:34 PM
  2. Digital Evidence - Article at CNN.com
    By zencoder in forum Computer Forensics
    Replies: 10
    Last Post: January 31st, 2005, 09:58 PM
  3. Cooling and noise basics
    By VictorKaum in forum Other Tutorials Forum
    Replies: 17
    Last Post: July 26th, 2003, 04:41 PM
  4. Replies: 1
    Last Post: July 15th, 2002, 03:46 AM
  5. The Worlds Longest Thread!
    By Noble Hamlet in forum AntiOnline's General Chit Chat
    Replies: 1100
    Last Post: March 17th, 2002, 09:38 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •