s_tools_tutorial.pdf

7/29/2019 s_tools_tutorial.pdf

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S-Tool v4.0 - Steganography Software

Tutorial

CREATE IMAGE WHICH CONTAINS A HIDDEN FILE

1. Click on the Stools4.zip file and extract all filesto your computer.

2. Select the S-Tools.exe file and open thesteganography software tool.

3. The main window of the program appears.4. Three buttons are available on the main window:

File

Window Help

5. With both the working directory and the S-Toolsprogram open minimize both windows and place

side-by-side.

6. The S-Tools program is a drag and dropsoftware. The files used to create thesteganography file can be dragged from the

directory into the S-Tools program.

7. Select a base file that will be used to hide ahidden file. A *.jpg file was selected as the basefile. Select the file from the directory and drag it

over the S-Tools main window and release the

file.

8. A dialogue box appears indicating that the filetype is unknown. Supported file types for audio

and image files are shown below:

Audio - *.wav Image - *.bmp and *.gif


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9. Select a valid audio file or image as the base filefor the steganography file. The barn_1.bmp was

selected and dragged onto the main window of

the S-Tools program. The image is opened.

10.The Barn_1.bmp and the Actions window arenow in the S-Tools program.

11.The Action window is a process window whichdisplays the process steps as a file is being

hidden within a base file.

12.Place the working directory and the base fileside-by-side.

13.Select a file to hide within the base file.14.The *.mp3 audio is selected and dragged on top

of the base image. Release the file while thecursor is still on top of the base file.

15.A dialogue box will appear asking the user toenter and verify a passphrase. Additionally, the

user will have to select an encryption algorithm.

16.Notice that the title of the dialogue box isHiding 15,849 bytes. The user is attempting to

hide 15, 849 bytes of data into a steganography

file.

17.Enter a passphrase in both the passphrase andverify passphrase text boxes.18.If the same passphrase is not entered in both text

boxes the OK button will be grayed out and the

user will not be able to proceed to creating the

steganography file.

19.Select the OK button after entering a validpassphrase.

20.The S-Tools main window will appear and a newfile will be visible. The name of the file will becalled hidden_data by default.

21.At this point, the original file has been selectedand opened, a second file have been selected andopened, and a passphrase has been selected.

22.Now the user has to save the steganography file.


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23.Place the cursor on top of the hidden data imageand select the right mouse button. The user will

have four options available to them:

Save Save As Properties Reveal

24.Selecting the Save and Save As buttons forthe first time will open a Save As dialogue box.

25.Select a directory path and filename, then selectthe Save button.

26.On this step the user is selecting a filename forthe steganography file, which contains a hiddenfile.

27.If the user is going to use S-Tools to open thesteganography file, a filename extension of either*.bmp, *.gif or *.wav must be used when saving

the steganography file.

28.After selecting the Save button the user canlocate the saved steganography file in theworking directory.

29.Selecting the Properties button while the cursoris over any image will display the following

properties:

Width and Height of the image Bits per pixel Memory Usage (file size in bytes) Compression

30.Selecting the Properties button while the cursoris over any audio file will display the followingproperties:

Audio Channels Sample Frequency Bits per sample


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31.Selecting the Reveal button will display apassphrase dialogue box.

32.A passphrase must be entered twice in thedialogue box and the correct encryption

algorithm must be selected.

33.Notice that the title of the dialogue box haschanged to Revealing from barn_1.bmp

34.Enter a passphrase twice, select the encryptionalgorithm, and select the OK button.

35.The main window of the S-Tools program willappear.

36.In the action window the user can see that theprogress of revealing a hidden message is at zero

percent (0%).

37.The original bmp was accidentally chosen. Usingthe Reveal button on a file which does notcontain a hidden file results in no file being

extracted from the base file.

38.Using the incorrect passphrase or incorrectencryption algorithm will also result in no file

being extracted from the base file.

39.Selecting the Reveal button, entering a correctpassphrase and selecting the correct encryption

algorithm will result in a dialogue box

displaying.

40.The action window will show the progressincreasing from zero percent until it reaches

100%.

41.A Revealed Archive dialogue box will displaywhich contains the file name and size of the

hidden file.

42.Place the cursor over the hidden file and selectthe right mouse button.

43.The user will be able to either Save the hiddenfile or gather the properties for the hidden file.

44.The properties dialogue box will show the userthe file name, compressed size and normal size.

45.The user cannot open the hidden file from the S-Tools program. The user can retrieve theproperties or save the file.


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46.Select the Save As button.47.A Save As dialogue box will appear.48.Enter a valid file name, select the working

directory and select the Save button.

49.The main window of the S-Tool program willappear.

50.Locate the files in the working directory.51.Open the files using a multimedia software

program and ensure that the files were extracted

from the steganography file successfully.

52.


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ANALYZE ALL FILES USED IN CREATION OF ENCRYPTED IMAGE

1. The user needs to locate the files used forencrypting the message on their computer.

2. A Total of four images were used to support thecreation of the steganography image. Below arethe image characteristics.

BARN_1.BMP

Pixel Dimensions: 384 x 288

Document Size: 2.667 x 2

Resolution : 144 pixels/inch

File Size : 352 KB

HIDDEN_BARN.BMP

Pixel Dimensions: 384 x 288

Document Size: 2.667 x 2

Resolution : 144 pixels/inch

File Size : 352 KB

HOUSTON.WAV

Audio Channels1 mono

Sampling Frequency11,025 Hz

Bits per Sample - 16

File Size : 38 KB

HIDDEN_HOUSTON.WAV

Audio Channels1 mono

Sampling Frequency11,025 Hz

Bits per Sample - 16

File Size : 38 KB

Barn_1.bmpOriginal image taken with digital camera and saved to computer in *.bmp format Houston.wavOriginal audio sound file downloaded from freeware web site and saved to computer. Hidden_Barn.bmpAfter embedding the Houston.wav file into the barn_1.bmp the file was saved as a

new file. There are no physical differences between the original image file and this file which contains

the hidden audio file.

Hidden_Houston.wavOpened the hidden_barn.bmp file and extracted the hidden *.wav file. Savedthis file to the working directory. There are no physical differences between the original audio file andthis file which was extracted from the steganography image hidden_barn.bmp.

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s_tools_tutorial.pdf