EMISSIONS SECURITY Elizabeth Eykman Supervisors:Stephen Gould & Matt Barrie.

Slides:



Advertisements
Similar presentations
University of Palestine Students name : Ammar abu zubida UN : Instructors name:Rasha atallh Thread :Types of computer screen.
Advertisements

Computer Graphics- SCC 342
Introduction to Raster scan display C A E D C Computer Aided Engineering Design Centre.
Equipe Simulation Visualising Your Imagination Achieving FAA / JAA Level D with current, low cost digital projection technology Contact:
CATHODE RAY TUBE.
1 Lecture 2 Main components of graphical systems Graphical devices.
Graphics Device Principles B.Sc. (Hons) Multimedia ComputingMedia Technologies.
Midterm Review. World is practically continuous in time space color brightness dynamic range brightness.
Screen Monitor Visual display unit (VDU)
Graphics Device Principles B.Sc. (Hons) Multimedia ComputingMedia Technologies.
EET 450 – Advanced Digital Video Display Systems.
Imaging Science Fundamentals Chester F. Carlson Center for Imaging Science Display Systems Viewing Images.
Day 19: Electrostatic Potential Energy & CRT Applications
CRT MONITOR cathode-ray tube
Computer Monitors B. Konkoth. Types of monitors CRT Cathode Ray Tube LCD Liquid Crystal Display.
Fluoroscopy: Viewing Systems
Terms 1. VGA VGA - Short for Video Graphics Array, VGA is a popular display standard developed by IBM and introduced in 1987 VGA provides 640 x 480 resolution.
Copyright © 2007 Heathkit Company, Inc. All Rights Reserved PC Fundamentals Presentation 40 – Displays and Resolution.
Examining Display Devices Computer Concepts Unit B.
Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill Technology Education Copyright © 2005 by The McGraw-Hill Companies,
CRT MONITOR cathode-ray tube
CRT MONITOR cathode-ray tube
Digital Imaging Systems –I/O. Workflow of digital imaging Two Competing imaging format for motion pictures Film vs Digital Video( TV) Presentation of.
Basics of a Computer Graphics System Introduction to Computer Graphics CSE 470/598 Arizona State University Dianne Hansford.
Lecture 03 Fasih ur Rehman
Peripherals The term peripherals refers to all hardware devices that are attached to your computer and are controlled by your computer system Peripherals.
display screens and ergonomics
Lecture No. 3.  Screen resolution  Color  Blank space between the pixels  Intentional image degradation  Brightness  Contrast  Refresh rate  Sensitivity.
CSCI-100 Introduction to Computing Hardware Part II.
Graphics Graphics Korea University cgvr.korea.ac.kr Raster Graphics 고려대학교 컴퓨터 그래픽스 연구실.
Computer Graphics Hardware
Overview of Graphics Systems. Cathode-ray Tube (CRT) - colors are represented using Red, Green, and Blue components - the CRT has a mechanism for.
CSE 494/598 Intro to Applied Computer Graphics Anshuman Razdan DCST AR's Web Page AR's Web Page
Electromagnetic Radiation from VDUs: An Eavesdropping Risk? Paul Shotbolt Article in “Computers and Security” Volume 4. Number 4.by Wim van Eck.
1 CP586 © Peter Lo 2003 Multimedia Communication Video Fundamentals.
Grade 8.  Pixel – Tiny dots that make up a picture shown on a monitor.  Resolution – How sharp and clear an image is. Usual measured by the amount of.
Hardware used in Multimedia Systems. Hardware demands on multimedia systems Multimedia puts huge demands on a computer system, so designers and users.
Lecture # 4 Output Devices. Output Devices Devices that convert machine language into human understandable form. Output can be in display form, on paper.
Introduction to Graphical Hardware Display Technologies
DECREASED FLICKER SENSITIVITY WITH A SCANNED LASER DISPLAY. J.P. Kelly 1, H.L. Pryor, E.S. Viirre, T. Furness III. 1 Children's Hospital & Medical Center;
Computer Organisation 1 Sébastien Piccand Display devices.
Display Technology INFO410 & INFO350 S Jack Pinches INFORMATION
Computer Fundamentals MSCH 233 Lecture 5. The Monitor A Monitor is a video screen that looks like a TV. It displays both the input data and instructions,
4.5 ELECTRON BEAMS ELECTRONS AND ELECTRONICS. Electron Beams Given enough energy, electrons can escape from a conductor and move through a vacuum space.Beams.
Output devices Prof. K Regis. Types of output devices Monitor Printer Speaker Plotter.
10/19 Monitors CRT monitors: Flat-panel displays Electron guns
Hardware Components Display. 1.Display (Monitor) The screen is made up of thousands of picture elements or pixels Displays can be either CRT (Cathode.
 Display Devices Display Devices  Display Hardware  Components of CRT Components of CRT  Refresh CRT Refresh CRT  Electron Gun  Focussing system.
Week 9 Monitors and output to the screen. Monitors, also known as Visual display units (V.D.Us) Desktop computers contain a Cathode Ray Tube (C.R.T.)
Name Enrolment no.: Dhruti Desai Khushboo Desai Sneha Gangwani Rajul Shah
Components of Computer. Output The data that has been processed into useful information is called output. Types –Screen – soft copy –Printer – hard copy.
Computer Graphics Lecture -02. Frame Buffer The image being displayed is stored in a dedicated system memory area that is often referred.
Computer Graphics Lecture 02 Graphics Systems Taqdees A. Siddiqi
1.  The primary output device in a graphics system is a video monitor. These monitors are based on Cathode Ray Tube (CRT) design.  CRT is a vacuum tube/electron.
Computer Graphics CC416 Lecture 02: Overview of Graphics Systems: Raster & Random Displays – Chapter 2 Dr. Manal Helal – Fall 2014.
The Cathode Ray Tube Monitor
Display devices and interfaces
How Does Your TV Work? A brief introduction.. Two Amazing Things about the Brain 1.Connecting the dots Pixels and resolution 2.Connecting the frames 15.
Computer Graphics Lecture 4 Computer Graphics Hardware
Computer Graphics Lecture 3 Computer Graphics Hardware
An Adept Edge Detection Algorithm for Human Knee Osteoarthritis Images
Overview of Graphics Systems
Types of monitors CRT Cathode Ray Tube LCD Liquid Crystal Display.
Overview of Graphics Systems
CATHODE RAY TUBE.
Graphics Systems SUBJECT: COMPUTER GRAPHICS LECTURE NO: 02 BATCH: 16BS(INFORMATION TECHNOLOGY) 1/4/
Fluoroscopy – Viewing Systems TV Monitors
Fluoroscopy – Viewing Systems TV Monitors
Chapter 2 Overview of Graphics Systems
CATHODE RAY TUBE By Dr. Vaibhav Jain Associate Professor, Dept. of Physics, D.A.V (PG) College, Bulandshahr, U.P., India.
Presentation transcript:

EMISSIONS SECURITY Elizabeth Eykman Supervisors:Stephen Gould & Matt Barrie

OBJECTIVES  Set up a successful lab experiment to measure optical emanations from a computer terminal  Investigate the information contained in optical emissions from CRT monitors  Reconstruct information from the optical signal  Suggest improvements to experiment and further work  Consider Countermeasures

BACKGROUND  In 1985, Van Eck demonstrated the reconstruction of a television CRT display by using the information carried in the electromagnetic radiation  In May 2002, Markus Kuhn published a paper (Optical Time-Domain Eavesdropping risks of CRT displays) to describe the reconstruction of a CRT display using the information contained in the optical emissions Emissions Security (Emsec) refers to the protection of a system from being attacked by way of compromising emanations.

EQUIPMENT SET UP Photomultiplier CRO Power Supply Computer for signal capturing and processing Source: CRT Raster Scan display monitor Diffuse reflections of information carrying emissions can be detected

PHOTOMULTIPLIER TUBE Vacuum Envelope Anode Dynodes Electron Shower Photocathode Received Field -V R load RASTER SCAN DISPLAY Horizontal retrace Vertical retrace Scan line

TEST PATTERNS Source DisplayPMT Output  Resolution of 640x480 pixels used for source display  Refresh rate period = 16.5ms  One pixel period= 16.5/(640x480) = ns

SINGLE PIXEL DECAY CURVES Source display The intensity function of the light emitted corresponds to the video signal convolved with the impulse response of the screen phosphors The phosphor decay curve can be thought of a low-pass filter applied to the video signal as it is emitted

PIXELS ON THE SAME SCAN LINE Source display Pixels on the same scan line can be clearly differentiated in the received signal if they are 2 or more pixels apart. (using the equipment available) Two white pixels on the same scan line were moved closer together

ADAPTIVE FILTER DESIGN Plant P(z) Delayed inverse model H(z)   z-z- Delay Input s k Plant noise n k + + dkdk + _ xkxk ykyk kk x k Noisy plant output y k Output signal  k Error signal d k Desired response DELAYED ADAPTIVE INVERSE MODEL  The transfer function of the model, H(z), is a best-fit to the inverse of the unknown transfer function of the system  Once converged, the adaptive filter output is a best least-squares match to the plant input  The derived inverse filter can now be used to reconstruct the video signal/data

LMS Algorithm: W k+1 = W k + 2µ  k X k W = weight vector µ = convergence parameter  = error X = input signal vector S k = Synthesized video signal X k = Photomultiplier output sksk xkxk 100ns ~53ns ~107ns Two white pixels 2 pixels apart The LMS algorithm is used to find the coefficients of the inverse filter

COUNTERMEASURES  Break the line of sight to display surfaces exhibiting sensitive information  Surrounded monitors by broadband background light to increase shot noise  Set the monitor to the highest resolution possible, minimum workable contrast and maximum brightness comfortable  Encrypt the raster scan algorithm of the CRT  Liquid Crystal Display (LCD) monitors can be used to replace CRT monitors as all pixels in a line are refreshed simultaneously and the pixel response times are slower

CONCLUSIONS FURTHER WORK  Development of a Real-Time application  Reconstruction of data to its true colours  Development of further countermeasures With the use of this simple, inexpensive experiment, it has been shown that information leakage from a CRT monitor via optical emissions is a security concern.