Lab 6 - Report file
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Apr 3, 2024
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Lab 6:
Recognizing the Use of Steganography in Image Files
Hannah Mathewson
Computer Forensics
COM-452-OL01
Professor James Jones
March 3, 2024
Section 1: Hands-On Demonstration
Part 1: Review Image Files using Microsoft Paint
7.) In the Lab Report file, document the file name file size for each image (.bmp file) in the folder.
Answer:
camaro2011.bmp 1,464 KB
Challenge.bmp 113 KB
ConfederateCipher.bmp 3,691 KB
Cyber1.bmp 4,528 KB
MountRainier.bmp 19,578 KB
StegoMessage.bmp 3,691 KB
TravelPhoto.bmp 19,578 KB
10.) In the Lab Report file, describe the content of the image
Answer:
The image file TravelPhoto.bmp has a town with multiple buildings and a massive mountain.
The image file camaro2011.bmp is a grey 2011 Chevrolet Camaro.
The image file Challenge.bmp is an old red school muscle car with white stripes.
The image file ConfederateCipher.bmp is the same image found in the StegoMessage.bmp file.
The image file cyber1.bmp shows a mysterious man with a hoodie and a laptop with a background of binary numbers.
The image file MountRainier.bmp is the same image found in the TravelPhoto.bmp file.
The image file StegoMessage.bmp is a cipher disk that has the whole alphabet.
Part 2: Use S-Tools to Reveal Steganography
7.) Make a screen capture showing the file name and file size of the revealed files and paste it into your Lab Report file.
8.) In the Lab Report file, document the encryption algorithm used to reveal the hidden files.
Answer:
The encryption algorithm used to reveal the hidden files is IDEA (International Data Encryption Algorithm).
13.) Make a screen capture showing the contents of the Cipherkey.txt file and paste it into your Lab Report file.
14.) In your Lab Report file, decipher the hidden message using the cipher key provided in Cipherkey.txt (
Hint: Try typing out the alphabet underneath the cipher key).
Answer:
The deciphered message is: This is a secret message for you to solve.
17.) In your Lab Report file, document the total file size of the revealed payload files.
Answer:
The total file size of the revealed payload files is 94 + 121,940 = 122,034
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18.) In your Lab Report file, compare that total with the file size of the source image documented
and explain your observations.
Answer:
The file size of the source image is 3,691 since it is only having the image but the revealed files have a massive number of words which makes the file larger.
Section 2: Applied Learning
Part 1: Review Image Files using Microsoft Paint
3.) In the Lab Report file, document the file name and file size for each image in the folder. Answer:
camaro2011.bmp 1,464 KB
Challenge.bmp 113 KB
ConfederateCipher.bmp 3,691 KB
Cyber1.bmp 4,528 KB
MountRainier.bmp 19,578 KB
StegoMessage.bmp 3,691 KB
TravelPhoto.bmp 19,578 KB
5.) In your Lab Report file, describe the image.
Answer:
The first image is camaro2011.bmp and it shows a grey 2011 Chevrolet Camaro with a custom front grill.
Part 2: Use S-Tools to Reveal Steganography
6.) Make a screen capture showing the file name and file size of the revealed file and paste it into
your Lab Report file.
9.) Make a screen capture showing the contents of the payload file embedded in the camaro2011.bmp file and paste it into your Lab Report file.
11.) Make a screen capture showing the contents of the payload file embedded in the cyber1.bmp
file and paste it into your Lab Report file.
12.) In your Lab Report file, document the total file size of the revealed payload files in both image files.
The total file size for the revealed camaro2011.bmp file is 250.
The total file size for the revealed cyber1.bmp file is 47.
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Section 3: Lab Challenge and Analysis
Part 1: Analysis and Discussion
1.) Research and compare the encryption algorithms found in S-Tools: IDEA, MDC, DES, 3DES.
Answer:
IDEA – faster than DES, doesn’t use NSA guidance, 128 bit key length, patented, applicable with Pretty Good Privacy
MDC – hash functions based on block ciphers, hash result is twice the length of the block cipher.
DES – 64 bit block cipher, 56-bit key, has initial and final permutation, able to partition into two 28 bit units, rotated left by the number of round (32 input left, 32 input right), simple logical operations.
3DES – uses DES three times in its algorithm, used previously in MS Office, Firefox, and EMV payment systems. Encrypts plaintext in k1, followed by decrypting with k2, then encrypting with
k3.
Part 2: Tools and Commands
1.) Repeat the steps from Part 2 of this lab for the following image files and corresponding encryption algorithm. Not all of the images in the lab will contain embedded files. If your investigation reveals no payload files, document that finding in your Challenge Questions file.
ConfederateCipher.bmp, using the DES encryption algorithm and password abcd.
Answer:
ConfederateCipher.bmp yielded no payload files.
MountRainier.bmp, using the MDC encryption algorithm and password abcd.
Answer:
MountRainier.bmp yielded no payload files.
TravelPhoto.bmp, using the TripleDES encryption algorithm and password abcd.
Part 3: Challenge Exercise
1.) Embed a text file name yourname.txt replacing yourname with your own name. The contents of the text file should be the sentence: I am yourname.
Embed the Challenge.bmp file from the StegoAndSamples folder.
Save the new image as yourname_MountRainier.bmp.
Open yourname_MountRainier.bmp in S-Tools and reveal the hidden files.
Make a screen capture showing the hidden files and paste it into your Lab Report.
Use the File Transfer button to download the yourname_MountRainier.bmp file to your local computer and submit the file with your deliverables for this lab.
In your Lab Report, provide the URL where your found instructions for completing this task.
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https://www.youtube.com/watch?v=eWDGBlmVSwA
used with S-tools.