ANNTS USER`S MANUAL
Contents
1. window should open on your screen w ACLI GU Stepanographic mape Analyrer Steganographic Message Detector aI 7 l Solected Iniage to An hzZ Analyze Selected a Ty Serbeet cle MRS Cor Sto 0 Image J me iaa mi Select an Image to Anahze jali wf Hidden Messag Artificial Neural Network Technology for Steganalysis iteag Sx pieg 100E by Enc Bartlett Chilord Bergman and Jennifer Davidson POSE Fh 100 Copyright C 2007 lowa State a ee Research Foundation Inc Wavelet Lob T00 The next step is to select a single image to analyze The folder in which the image is located must be known before proceeding 1 First select the drive that the image is on by selecting the correct drive on your computer using the pull down menu located at the middle top of the ANNTS window In the screen shot below the drive C was chosen 2 Then double click on the drive label which is at the top of the second menu This lists the current directories on your computer on that drive and gets rid of the default directory C Stego ACLI ISU Stepanographic imase Analyser Steganographic Message Detector e Salected Image to Anahyre Analyze Selected ties acl T e ag hz ima beah C Stego ipa zi E ia l 1 HE r Sy tral 2 Sect an Image to Analyze Hidden Messag Artificial Neural Network Technology Found tor Steganalysis P jng SOX by Enc Bartlett Clif2. ANNTS USER S MANUAL This document contains information to help you run the ANNTS software program Background Information What this program does This software program is a proof of concept of using artificial neural networks to classify an image as an innocent image containing no hidden message or a stego image containing a hidden message Thus this program has limitations which we list below 1 The software can check for messages hidden using one of three different types of embedding algorithms a Jsteg jpeg at 50 of full capacity or Jsteg jpeg at 100 of full capacity b F5 at 50 of full capacity or F5 at 100 of full capacity c A simple wavelet embedding algorithm at 50 or 100 of full capacity 2 Only one image at a time can be checked for hidden content Full capacity means the largest possible amount of data that can be embedded into the image using the prescribed algorithm This varies from image to image due to the particular embedding algorithms used What this program does not do 1 The program cannot extract the hidden message 2 The program cannot analyze more than one image at a time it cannot analyze a directory of images all at once for example 3 The program cannot analyze an image whose path name as appears in the Selected Image to Analyze has a space To start the program Double click on the icon labeled steganalysis on the desktop The following window called the ANNTS
3. e bmp then there are only two possible outcomes wavelet LSB 50 or wavelet LSB 100 Any boxes that are checked means that the ANNTS software suspects that the image contains data hidden with the corresponding embedding algorithm listed besides the checked box In this example both the boxes for F5 have been checked Notes l The first time that Analyze Selected Image is selected after the ANNTS window is run the program must load up the C library of code to run the feature selection on the image data It may take several minutes or more depending on your computer s memory configuration to analyze the first image Subsequent analysis of images will not typically take as long providing the window remains open during these analyses Also very large image data can take long to run several minutes To analyze more than one image go through steps 1 through 5 as described above to analyze the first image Then for subsequent images without restarting the ANNTS window simply click on a different image name or change directories and choose another image in a different directory so that its name appears in the dialog box Selected Image to Analyze It is possible that two boxes can be checked such as F5 50 and F5 100 If a box is checked the ANNTS software has determined that the suspicious image meets the criterion for that embedding algorithm However it does not mean that the suspicious image is guaranteed to have hidde
4. ford Bergman and mag 100 Jennifer Davidson Fa Ae r FS Oc Copyright C 2007 lowa Stale Research Foundation line M Wave LR Sz M Wavelet LSB 100 3 You can then select the path to your image of interest by double clicking on successive folders until you see your image listed in one of the two boxes on the right hand side of the ANNTS window If no image names appear in the boxes then that directory contains no images of the appropriate type that ANNTS can analyze The top box contains jpeg formatted images type Jpg and the lower box contains bitmap images type bmp In this example of the screen shot shown below the directory C Davidson Image Data was selected w ACLI GU Stepanographic image Analyzer Steganographic Message Detector c i Analyze Selected i S lected Image to Analyze Image Erstes oo 5 Dee s Data Select an Image to Analyze Hidden Message Artificial Neural Network Technology Found for Steganalysis C jateg So by Enc Bartlett Clifford Bergman and fateg 100 Jennifer Davidson gt ssir imr Copyright C 2007 lowa State Research Foundation Inc T Wevelel L30 Som Wavelet LOG 100 4 When the image name appears in the box click once to bring that image name into the box labeled Selected Image to Analyze In this example the image singing monkey jpg was selected ALT ISU Stepanographic Image Analyrer Steganographic Message Detector Quit Selected I
5. mage to Analyze Analyze Selected aca Image ia CADawdeon inage Datateinging monkay pa Debi Daa z7 Select an Image to Analyze FE pa EE mWiHErE P Hidden Message Artificial Neural Network Technology Found tor Steganalysis r jaag 50 by Eric Bartlett Clifford Bergman and x senate Jennifer Davidson FS Saree FS ton Copynght C 2007 lowa State z M Waea LAR S0 Research Foundation line wavelet LOB 100c 5 Once the image name is listed correctly under Selected Image to Analyze then click on the box labeled Analyze Selected Image located on the left side of the ANNTS window ACI ISU Steganographic Image Analyzer Steganographic Message Detector Analyze Selected a Selected Image to Analyze Image 2 4 de C Davideon image Data singing monkay p9 Select an Image to Analyze Hidden Message Artificial Neural Network Technology Found tor Steganalysis jsteg 50 by Eric Bartlett Clifford Bergman and 9 100x Jennifer Davidson W FS SOs w FS 1003 Copyright C 2007 lowa State Research Foundation Inc Results of the analysis When the program is finished analyzing the image data and classifying it one or more of the six classification boxes will be displayed in the center of the ANNTS window If the suspicious image was a jpg type then there will be only four possible outcomes jsteg 50 jsteg 100 F5 50 or F5 100 If the suspicious image was of typ
6. n information in it just a high likelihood Appendix For further reference and details please consult the following two publications L 2 Bergman C and Davidson J An Artificial Neural Network for Wavelet Steganalysis final report Midwest Forensics Resource Center January 2007 Davidson J Bergman C and Bartlett E An artificial neural network for wavelet steganalysis Proceedings of SPIE The International Society for Optical Engineering vol 5916 Mathematical Methods in Pattern and Image Analysis 2005 pp 1 10
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